diff --git a/CMakeLists.txt b/CMakeLists.txt
index 3950274790..dbe4c406bd 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -300,6 +300,8 @@ configure_file(${OpenMW_SOURCE_DIR}/files/openmw.cfg
 if (NOT WIN32 AND NOT APPLE)
     configure_file(${OpenMW_SOURCE_DIR}/files/openmw.desktop
         "${OpenMW_BINARY_DIR}/openmw.desktop")
+    configure_file(${OpenMW_SOURCE_DIR}/files/opencs.desktop
+        "${OpenMW_BINARY_DIR}/opencs.desktop")
 endif()
 
 # Compiler settings
diff --git a/apps/openmw/engine.cpp b/apps/openmw/engine.cpp
index f76590ae85..ce84b8dfe1 100644
--- a/apps/openmw/engine.cpp
+++ b/apps/openmw/engine.cpp
@@ -149,16 +149,22 @@ OMW::Engine::~Engine()
     delete mOgre;
 }
 
-// Load all BSA files in data directory.
+// Load BSA files
 
 void OMW::Engine::loadBSA()
 {
-    const Files::MultiDirCollection& bsa = mFileCollections.getCollection (".bsa");
-
-    for (Files::MultiDirCollection::TIter iter(bsa.begin()); iter!=bsa.end(); ++iter)
+    for (std::vector<std::string>::const_iterator archive = mArchives.begin(); archive != mArchives.end(); ++archive)
     {
-        std::cout << "Adding " << iter->second.string() << std::endl;
-        Bsa::addBSA(iter->second.string());
+        if (mFileCollections.doesExist(*archive))
+        {
+            const std::string archivePath = mFileCollections.getPath(*archive).string();
+            std::cout << "Adding BSA archive " << archivePath << std::endl;
+            Bsa::addBSA(archivePath);
+        }
+        else
+        {
+            std::cout << "Archive " << *archive << " not found" << std::endl;
+        }
     }
 
     const Files::PathContainer& dataDirs = mFileCollections.getPaths();
@@ -199,6 +205,11 @@ void OMW::Engine::setDataDirs (const Files::PathContainer& dataDirs)
     mFileCollections = Files::Collections (dataDirs, !mFSStrict);
 }
 
+// Add BSA archive
+void OMW::Engine::addArchive (const std::string& archive) {
+    mArchives.push_back(archive);
+}
+
 // Set resource dir
 void OMW::Engine::setResourceDir (const boost::filesystem::path& parResDir)
 {
diff --git a/apps/openmw/engine.hpp b/apps/openmw/engine.hpp
index a4acee5232..f80b67a358 100644
--- a/apps/openmw/engine.hpp
+++ b/apps/openmw/engine.hpp
@@ -64,6 +64,7 @@ namespace OMW
             ToUTF8::FromType mEncoding;
             ToUTF8::Utf8Encoder* mEncoder;
             Files::PathContainer mDataDirs;
+            std::vector<std::string> mArchives;
             boost::filesystem::path mResDir;
             OEngine::Render::OgreRenderer *mOgre;
             std::string mCellName;
@@ -99,7 +100,7 @@ namespace OMW
             /// add a .zip resource
             void addZipResource (const boost::filesystem::path& path);
 
-            /// Load all BSA files in data directory.
+            /// Load BSA files
             void loadBSA();
 
             void executeLocalScripts();
@@ -126,6 +127,9 @@ namespace OMW
             /// Set data dirs
             void setDataDirs(const Files::PathContainer& dataDirs);
 
+            /// Add BSA archive
+            void addArchive(const std::string& archive);
+
             /// Set resource dir
             void setResourceDir(const boost::filesystem::path& parResDir);
 
diff --git a/apps/openmw/main.cpp b/apps/openmw/main.cpp
index 86978c9b11..1fa461c2fb 100644
--- a/apps/openmw/main.cpp
+++ b/apps/openmw/main.cpp
@@ -100,6 +100,9 @@ bool parseOptions (int argc, char** argv, OMW::Engine& engine, Files::Configurat
         ("data-local", bpo::value<std::string>()->default_value(""),
             "set local data directory (highest priority)")
 
+        ("fallback-archive", bpo::value<StringsVector>()->default_value(StringsVector(), "fallback-archive")
+            ->multitoken(), "set fallback BSA archives (later archives have higher priority)")
+
         ("resources", bpo::value<std::string>()->default_value("resources"),
             "set resources directory")
 
@@ -201,6 +204,13 @@ bool parseOptions (int argc, char** argv, OMW::Engine& engine, Files::Configurat
 
     engine.setDataDirs(dataDirs);
 
+    // fallback archives
+    StringsVector archives = variables["fallback-archive"].as<StringsVector>();
+    for (StringsVector::const_iterator it = archives.begin(); it != archives.end(); it++)
+    {
+        engine.addArchive(*it);
+    }
+
     engine.setResourceDir(variables["resources"].as<std::string>());
 
     // master and plugin
diff --git a/apps/openmw/mwgui/dialogue.cpp b/apps/openmw/mwgui/dialogue.cpp
index 859e3008cc..cdcbfc4d18 100644
--- a/apps/openmw/mwgui/dialogue.cpp
+++ b/apps/openmw/mwgui/dialogue.cpp
@@ -223,50 +223,60 @@ void DialogueWindow::onByeClicked(MyGUI::Widget* _sender)
     MWBase::Environment::get().getDialogueManager()->goodbyeSelected();
 }
 
-void DialogueWindow::onSelectTopic(std::string topic)
+void DialogueWindow::onSelectTopic(const std::string& topic, int id)
 {
     if (!mEnabled) return;
 
-    const MWWorld::Store<ESM::GameSetting> &gmst =
-        MWBase::Environment::get().getWorld()->getStore().get<ESM::GameSetting>();
+    int separatorPos = mTopicsList->getItemCount();
+    for (unsigned int i=0; i<mTopicsList->getItemCount(); ++i)
+    {
+        if (mTopicsList->getItemNameAt(i) == "")
+            separatorPos = i;
+    }
 
-    if (topic == gmst.find("sBarter")->getString())
-    {
-        /// \todo check if the player is allowed to trade with this actor (e.g. faction rank high enough)?
-        mWindowManager.pushGuiMode(GM_Barter);
-        mWindowManager.getTradeWindow()->startTrade(mPtr);
-    }
-    if (topic == gmst.find("sPersuasion")->getString())
-    {
-        mPersuasionDialog.setVisible(true);
-    }
-    else if (topic == gmst.find("sSpells")->getString())
-    {
-        mWindowManager.pushGuiMode(GM_SpellBuying);
-        mWindowManager.getSpellBuyingWindow()->startSpellBuying(mPtr);
-    }
-    else if (topic == gmst.find("sTravel")->getString())
-    {
-        mWindowManager.pushGuiMode(GM_Travel);
-        mWindowManager.getTravelWindow()->startTravel(mPtr);
-    }
-    else if (topic == gmst.find("sSpellMakingMenuTitle")->getString())
-    {
-        mWindowManager.pushGuiMode(GM_SpellCreation);
-        mWindowManager.startSpellMaking (mPtr);
-    }
-    else if (topic == gmst.find("sEnchanting")->getString())
-    {
-        mWindowManager.pushGuiMode(GM_Enchanting);
-        mWindowManager.startEnchanting (mPtr);
-    }
-    else if (topic == gmst.find("sServiceTrainingTitle")->getString())
-    {
-        mWindowManager.pushGuiMode(GM_Training);
-        mWindowManager.startTraining (mPtr);
-    }
-    else
+    if (id > separatorPos)
         MWBase::Environment::get().getDialogueManager()->keywordSelected(lower_string(topic));
+    else
+    {
+        const MWWorld::Store<ESM::GameSetting> &gmst =
+            MWBase::Environment::get().getWorld()->getStore().get<ESM::GameSetting>();
+
+        if (topic == gmst.find("sBarter")->getString())
+        {
+            /// \todo check if the player is allowed to trade with this actor (e.g. faction rank high enough)?
+            mWindowManager.pushGuiMode(GM_Barter);
+            mWindowManager.getTradeWindow()->startTrade(mPtr);
+        }
+        if (topic == gmst.find("sPersuasion")->getString())
+        {
+            mPersuasionDialog.setVisible(true);
+        }
+        else if (topic == gmst.find("sSpells")->getString())
+        {
+            mWindowManager.pushGuiMode(GM_SpellBuying);
+            mWindowManager.getSpellBuyingWindow()->startSpellBuying(mPtr);
+        }
+        else if (topic == gmst.find("sTravel")->getString())
+        {
+            mWindowManager.pushGuiMode(GM_Travel);
+            mWindowManager.getTravelWindow()->startTravel(mPtr);
+        }
+        else if (topic == gmst.find("sSpellMakingMenuTitle")->getString())
+        {
+            mWindowManager.pushGuiMode(GM_SpellCreation);
+            mWindowManager.startSpellMaking (mPtr);
+        }
+        else if (topic == gmst.find("sEnchanting")->getString())
+        {
+            mWindowManager.pushGuiMode(GM_Enchanting);
+            mWindowManager.startEnchanting (mPtr);
+        }
+        else if (topic == gmst.find("sServiceTrainingTitle")->getString())
+        {
+            mWindowManager.pushGuiMode(GM_Training);
+            mWindowManager.startTraining (mPtr);
+        }
+    }
 }
 
 void DialogueWindow::startDialogue(MWWorld::Ptr actor, std::string npcName)
diff --git a/apps/openmw/mwgui/dialogue.hpp b/apps/openmw/mwgui/dialogue.hpp
index e39cecc3cf..a8e0a6d174 100644
--- a/apps/openmw/mwgui/dialogue.hpp
+++ b/apps/openmw/mwgui/dialogue.hpp
@@ -85,7 +85,7 @@ namespace MWGui
         };
 
     protected:
-        void onSelectTopic(std::string topic);
+        void onSelectTopic(const std::string& topic, int id);
         void onByeClicked(MyGUI::Widget* _sender);
         void onHistoryClicked(MyGUI::Widget* _sender);
         void onMouseWheel(MyGUI::Widget* _sender, int _rel);
diff --git a/apps/openmw/mwgui/list.cpp b/apps/openmw/mwgui/list.cpp
index d60e9b6877..c7b7207305 100644
--- a/apps/openmw/mwgui/list.cpp
+++ b/apps/openmw/mwgui/list.cpp
@@ -1,9 +1,9 @@
 #include "list.hpp"
 
-#include <MyGUI_ScrollView.h>
 #include <MyGUI_Gui.h>
 #include <MyGUI_Button.h>
 #include <MyGUI_ImageBox.h>
+#include <MyGUI_ScrollBar.h>
 
 using namespace MWGui;
 using namespace MWGui::Widgets;
@@ -23,7 +23,7 @@ void MWList::initialiseOverride()
     if (mClient == 0)
         mClient = this;
 
-    mScrollView = mClient->createWidgetReal<MyGUI::ScrollView>(
+    mScrollView = mClient->createWidgetReal<MWGui::Widgets::MWScrollView>(
         "MW_ScrollView", MyGUI::FloatCoord(0.0, 0.0, 1.0, 1.0),
         MyGUI::Align::Top | MyGUI::Align::Left | MyGUI::Align::Stretch, getName() + "_ScrollView");
 }
@@ -48,6 +48,7 @@ void MWList::redraw(bool scrollbarShown)
     const int _scrollBarWidth = 24; // fetch this from skin?
     const int scrollBarWidth = scrollbarShown ? _scrollBarWidth : 0;
     const int spacing = 3;
+    size_t scrollbarPosition = mScrollView->getScrollPosition();
 
     while (mScrollView->getChildCount())
     {
@@ -55,6 +56,7 @@ void MWList::redraw(bool scrollbarShown)
     }
 
     mItemHeight = 0;
+    int i=0;
     for (std::vector<std::string>::const_iterator it=mItems.begin();
         it!=mItems.end(); ++it)
     {
@@ -71,6 +73,7 @@ void MWList::redraw(bool scrollbarShown)
 
             int height = button->getTextSize().height;
             button->setSize(MyGUI::IntSize(button->getSize().width, height));
+            button->setUserData(i);
 
             mItemHeight += height + spacing;
         }
@@ -83,11 +86,17 @@ void MWList::redraw(bool scrollbarShown)
 
             mItemHeight += 18 + spacing;
         }
+        ++i;
     }
     mScrollView->setCanvasSize(mClient->getSize().width + (_scrollBarWidth-scrollBarWidth), std::max(mItemHeight, mClient->getSize().height));
 
     if (!scrollbarShown && mItemHeight > mClient->getSize().height)
         redraw(true);
+
+    size_t scrollbarRange = mScrollView->getScrollRange();
+    if(scrollbarPosition > scrollbarRange)
+        scrollbarPosition = scrollbarRange;
+    mScrollView->setScrollPosition(scrollbarPosition);
 }
 
 bool MWList::hasItem(const std::string& name)
@@ -129,8 +138,8 @@ void MWList::onMouseWheel(MyGUI::Widget* _sender, int _rel)
 void MWList::onItemSelected(MyGUI::Widget* _sender)
 {
     std::string name = static_cast<MyGUI::Button*>(_sender)->getCaption();
-
-    eventItemSelected(name);
+    int id = *_sender->getUserData<int>();
+    eventItemSelected(name, id);
     eventWidgetSelected(_sender);
 }
 
@@ -138,3 +147,17 @@ MyGUI::Widget* MWList::getItemWidget(const std::string& name)
 {
     return mScrollView->findWidget (getName() + "_item_" + name);
 }
+
+size_t MWScrollView::getScrollPosition()
+{
+    return getVScroll()->getScrollPosition();
+}
+
+void MWScrollView::setScrollPosition(size_t position)
+{
+    getVScroll()->setScrollPosition(position);
+}
+size_t MWScrollView::getScrollRange()
+{
+    return getVScroll()->getScrollRange();
+}
diff --git a/apps/openmw/mwgui/list.hpp b/apps/openmw/mwgui/list.hpp
index 38797e7798..09e42e865e 100644
--- a/apps/openmw/mwgui/list.hpp
+++ b/apps/openmw/mwgui/list.hpp
@@ -2,16 +2,24 @@
 #define MWGUI_LIST_HPP
 
 #include <MyGUI_Widget.h>
-
-namespace MyGUI
-{
-    class ScrollView;
-}
+#include <MyGUI_ScrollView.h>
 
 namespace MWGui
 {
     namespace Widgets
     {
+        /**
+         * \brief a custom ScrollView which has access to scrollbar properties
+         */
+        class MWScrollView : public MyGUI::ScrollView
+        {
+            MYGUI_RTTI_DERIVED(MWScrollView)
+        public:
+            size_t getScrollPosition();
+            void setScrollPosition(size_t);
+            size_t getScrollRange();
+        };
+
         /**
          * \brief a very simple list widget that supports word-wrapping entries
          * \note if the width or height of the list changes, you must call adjustSize() method
@@ -22,14 +30,14 @@ namespace MWGui
         public:
             MWList();
 
-            typedef MyGUI::delegates::CMultiDelegate1<std::string> EventHandle_String;
+            typedef MyGUI::delegates::CMultiDelegate2<const std::string&, int> EventHandle_StringInt;
             typedef MyGUI::delegates::CMultiDelegate1<MyGUI::Widget*> EventHandle_Widget;
 
             /**
              * Event: Item selected with the mouse.
              * signature: void method(std::string itemName)
              */
-            EventHandle_String eventItemSelected;
+            EventHandle_StringInt eventItemSelected;
 
             /**
              * Event: Item selected with the mouse.
@@ -63,7 +71,7 @@ namespace MWGui
             void onItemSelected(MyGUI::Widget* _sender);
 
         private:
-            MyGUI::ScrollView* mScrollView;
+            MWGui::Widgets::MWScrollView* mScrollView;
             MyGUI::Widget* mClient;
 
             std::vector<std::string> mItems;
diff --git a/apps/openmw/mwgui/windowmanagerimp.cpp b/apps/openmw/mwgui/windowmanagerimp.cpp
index d866ec7557..0e4c3a6082 100644
--- a/apps/openmw/mwgui/windowmanagerimp.cpp
+++ b/apps/openmw/mwgui/windowmanagerimp.cpp
@@ -132,6 +132,7 @@ WindowManager::WindowManager(
     MyGUI::FactoryManager::getInstance().registerFactory<MWGui::Widgets::AutoSizedButton>("Widget");
     MyGUI::FactoryManager::getInstance().registerFactory<MWGui::ImageButton>("Widget");
     MyGUI::FactoryManager::getInstance().registerFactory<MWGui::ExposedWindow>("Widget");
+    MyGUI::FactoryManager::getInstance().registerFactory<MWGui::Widgets::MWScrollView>("Widget");
 
     MyGUI::FactoryManager::getInstance().registerFactory<ResourceImageSetPointerFix>("Resource", "ResourceImageSetPointer");
     MyGUI::ResourceManager::getInstance().load("core.xml");
diff --git a/apps/openmw/mwmechanics/alchemy.cpp b/apps/openmw/mwmechanics/alchemy.cpp
index 8ab81bfdf0..7182003720 100644
--- a/apps/openmw/mwmechanics/alchemy.cpp
+++ b/apps/openmw/mwmechanics/alchemy.cpp
@@ -144,7 +144,11 @@ void MWMechanics::Alchemy::updateEffects()
             MWBase::Environment::get().getWorld()->getStore().get<ESM::MagicEffect>().find (iter->mId);         
         
         if (magicEffect->mData.mBaseCost<=0)
-            throw std::runtime_error ("invalid base cost for magic effect " + iter->mId);
+        {
+            std::ostringstream os;
+            os << "invalid base cost for magic effect " << iter->mId;
+            throw std::runtime_error (os.str());
+        }
         
         float fPotionT1MagMul =
             MWBase::Environment::get().getWorld()->getStore().get<ESM::GameSetting>().find ("fPotionT1MagMult")->getFloat();
diff --git a/components/files/collections.cpp b/components/files/collections.cpp
index 50340dca4d..c6195d88cf 100644
--- a/components/files/collections.cpp
+++ b/components/files/collections.cpp
@@ -31,6 +31,32 @@ namespace Files
         return iter->second;
     }
 
+    boost::filesystem::path Collections::getPath(const std::string& file) const
+    {
+        for (Files::PathContainer::const_iterator iter = mDirectories.begin();
+             iter != mDirectories.end(); ++iter)
+        {
+            const boost::filesystem::path path = *iter / file;
+            if (boost::filesystem::exists(path))
+                return path.string();
+        }
+
+        throw std::runtime_error ("file " + file + " not found");
+    }
+
+    bool Collections::doesExist(const std::string& file) const
+    {
+        for (Files::PathContainer::const_iterator iter = mDirectories.begin();
+             iter != mDirectories.end(); ++iter)
+        {
+            const boost::filesystem::path path = *iter / file;
+            if (boost::filesystem::exists(path))
+                return true;
+        }
+
+        return false;
+    }
+
     const Files::PathContainer& Collections::getPaths() const
     {
         return mDirectories;
diff --git a/components/files/collections.hpp b/components/files/collections.hpp
index ed4aafa133..def61cf8ef 100644
--- a/components/files/collections.hpp
+++ b/components/files/collections.hpp
@@ -19,6 +19,16 @@ namespace Files
             /// leading dot and must be all lower-case.
             const MultiDirCollection& getCollection(const std::string& extension) const;
 
+            boost::filesystem::path getPath(const std::string& file) const;
+            ///< Return full path (including filename) of \a file.
+            ///
+            /// If the file does not exist in any of the collection's
+            /// directories, an exception is thrown. \a file must include the
+            /// extension.
+
+            bool doesExist(const std::string& file) const;
+            ///< \return Does a file with the given name exist?
+
             const Files::PathContainer& getPaths() const;
 
         private:
diff --git a/files/opencs.desktop b/files/opencs.desktop
new file mode 100644
index 0000000000..f6aad5b097
--- /dev/null
+++ b/files/opencs.desktop
@@ -0,0 +1,9 @@
+[Desktop Entry]
+Type=Application
+Name=OpenMW Content Editor
+GenericName=Content Editor
+Comment=A replacement for the Morrowind Construction Set.
+TryExec=opencs
+Exec=opencs
+Icon=opencs
+Categories=Game;RolePlaying;