diff --git a/src/gui/game/GameController.cpp b/src/gui/game/GameController.cpp
index fe8278883..fc4c15628 100644
--- a/src/gui/game/GameController.cpp
+++ b/src/gui/game/GameController.cpp
@@ -351,6 +351,12 @@ void GameController::AdjustBrushSize(int direction, bool logarithmic, bool xAxis
 	BrushChanged(gameModel->GetBrushID(), gameModel->GetBrush()->GetRadius().X, gameModel->GetBrush()->GetRadius().Y);
 }
 
+void GameController::SetBrushSize(ui::Point newSize)
+{
+	gameModel->GetBrush()->SetRadius(newSize);
+	BrushChanged(gameModel->GetBrushID(), gameModel->GetBrush()->GetRadius().X, gameModel->GetBrush()->GetRadius().Y);
+}
+
 void GameController::AdjustZoomSize(int direction, bool logarithmic)
 {
 	int newSize;
diff --git a/src/gui/game/GameController.h b/src/gui/game/GameController.h
index 88337a03e..a7cdfc94b 100644
--- a/src/gui/game/GameController.h
+++ b/src/gui/game/GameController.h
@@ -81,6 +81,7 @@ public:
 	void SetZoomEnabled(bool zoomEnable);
 	void SetZoomPosition(ui::Point position);
 	void AdjustBrushSize(int direction, bool logarithmic = false, bool xAxis = false, bool yAxis = false);
+	void SetBrushSize(ui::Point newSize);
 	void AdjustZoomSize(int direction, bool logarithmic = false);
 	void ToolClick(int toolSelection, ui::Point point);
 	void DrawPoints(int toolSelection, queue<ui::Point> & pointQueue);
diff --git a/src/lua/LegacyLuaAPI.cpp b/src/lua/LegacyLuaAPI.cpp
index 16bd68b2e..ca67c8919 100644
--- a/src/lua/LegacyLuaAPI.cpp
+++ b/src/lua/LegacyLuaAPI.cpp
@@ -588,26 +588,14 @@ int luacon_mouseevent(int mx, int my, int mb, int event, int mouse_wheel)
 	return mpcontinue;
 }
 
-int luacon_step(int mx, int my, std::string selectl, std::string selectr, std::string selectalt, std::string selectreplace, int bsx, int bsy)
+int luacon_step(int mx, int my)
 {
 	int i, j, callret;
 	lua_State* l=luacon_ci->l;
-	lua_pushinteger(l, bsy);
-	lua_pushinteger(l, bsx);
-	lua_pushstring(l, selectreplace.c_str());
-	lua_pushstring(l, selectalt.c_str());
-	lua_pushstring(l, selectr.c_str());
-	lua_pushstring(l, selectl.c_str());
 	lua_pushinteger(l, my);
 	lua_pushinteger(l, mx);
 	lua_setfield(l, tptProperties, "mousex");
 	lua_setfield(l, tptProperties, "mousey");
-	lua_setfield(l, tptProperties, "selectedl");
-	lua_setfield(l, tptProperties, "selectedr");
-	lua_setfield(l, tptProperties, "selecteda");
-	lua_setfield(l, tptProperties, "selectedreplace");
-	lua_setfield(l, tptProperties, "brushx");
-	lua_setfield(l, tptProperties, "brushy");
 	lua_pushstring(l, "stepfunctions");
 	lua_rawget(l, LUA_REGISTRYINDEX);
 	if(!lua_istable(l, -1))
diff --git a/src/lua/LuaScriptHelper.h b/src/lua/LuaScriptHelper.h
index 6b8280337..b99082300 100644
--- a/src/lua/LuaScriptHelper.h
+++ b/src/lua/LuaScriptHelper.h
@@ -21,7 +21,7 @@ extern int tptElements; //Table for TPT element names
 extern int tptParts, tptPartsMeta, tptElementTransitions, tptPartsCData, tptPartMeta, tptPart, cIndex;
 
 void luacon_hook(lua_State *L, lua_Debug *ar);
-int luacon_step(int mx, int my, std::string , std::string selectr, std::string selectedalt, std::string selectedreplace, int bsx, int bsy);
+int luacon_step(int mx, int my);
 int luacon_mouseevent(int mx, int my, int mb, int event, int mouse_wheel);
 int luacon_keyevent(int key, int modifier, int event);
 int luacon_eval(const char *command);
diff --git a/src/lua/LuaScriptInterface.cpp b/src/lua/LuaScriptInterface.cpp
index 618e64192..281d54dd5 100644
--- a/src/lua/LuaScriptInterface.cpp
+++ b/src/lua/LuaScriptInterface.cpp
@@ -73,6 +73,18 @@ int atPanic(lua_State *l)
 	throw std::runtime_error("Unprotected lua panic: " + std::string(lua_tostring(l, -1)));
 }
 
+int TptIndexClosure(lua_State *l)
+{
+	LuaScriptInterface *lsi = (LuaScriptInterface *)lua_touserdata(l, lua_upvalueindex(1));
+	return lsi->tpt_index(l);
+}
+
+int TptNewindexClosure(lua_State *l)
+{
+	LuaScriptInterface *lsi = (LuaScriptInterface *)lua_touserdata(l, lua_upvalueindex(1));
+	return lsi->tpt_newIndex(l);
+}
+
 LuaScriptInterface::LuaScriptInterface(GameController * c, GameModel * m):
 	CommandInterface(c, m),
 	currentCommand(false),
@@ -214,14 +226,6 @@ LuaScriptInterface::LuaScriptInterface(GameController * c, GameModel * m):
 	lua_setfield(l, tptProperties, "mousex");
 	lua_pushinteger(l, 0);
 	lua_setfield(l, tptProperties, "mousey");
-	lua_pushstring(l, "DEFAULT_PT_DUST");
-	lua_setfield(l, tptProperties, "selectedl");
-	lua_pushstring(l, "DEFAULT_PT_NONE");
-	lua_setfield(l, tptProperties, "selectedr");
-	lua_pushstring(l, "DEFAULT_PT_NONE");
-	lua_setfield(l, tptProperties, "selecteda");
-	lua_pushstring(l, "DEFAULT_PT_NONE");
-	lua_setfield(l, tptProperties, "selectedreplace");
 
 	lua_newtable(l);
 	tptPropertiesVersion = lua_gettop(l);
@@ -332,6 +336,16 @@ tpt.partsdata = nil");
 		lua_gr_func[i] = 0;
 	}
 
+	//make tpt.* a metatable
+	lua_newtable(l);
+	lua_pushlightuserdata(l, this);
+	lua_pushcclosure(l, TptIndexClosure, 1);
+	lua_setfield(l, -2, "__index");
+	lua_pushlightuserdata(l, this);
+	lua_pushcclosure(l, TptNewindexClosure, 1);
+	lua_setfield(l, -2, "__newindex");
+	lua_setmetatable(l, -2);
+
 }
 
 void LuaScriptInterface::Init()
@@ -351,6 +365,79 @@ void LuaScriptInterface::SetWindow(ui::Window * window)
 	Window = window;
 }
 
+int LuaScriptInterface::tpt_index(lua_State *l)
+{
+	std::string key = luaL_checkstring(l, 2);
+	if (!key.compare("selectedl"))
+		return lua_pushstring(l, luacon_selectedl.c_str()), 1;
+	if (!key.compare("selectedr"))
+		return lua_pushstring(l, luacon_selectedr.c_str()), 1;
+	if (!key.compare("selecteda"))
+		return lua_pushstring(l, luacon_selectedalt.c_str()), 1;
+	if (!key.compare("selectedreplace"))
+		return lua_pushstring(l, luacon_selectedreplace.c_str()), 1;
+	if (!key.compare("brushx"))
+		return lua_pushnumber(l, luacon_brushx), 1;
+	if (!key.compare("brushy"))
+		return lua_pushnumber(l, luacon_brushy), 1;
+	if (!key.compare("brushID"))
+		return lua_pushnumber(l, m->GetBrushID()), 1;
+
+	//if not a special key, return the value in the table
+	return lua_rawget(l, 1), 1;
+}
+
+int LuaScriptInterface::tpt_newIndex(lua_State *l)
+{
+	std::string key = luaL_checkstring(l, 2);
+	if (!key.compare("selectedl"))
+	{
+		Tool *t = m->GetToolFromIdentifier(luaL_checkstring(l, 3));
+		if (t)
+			c->SetActiveTool(0, t);
+		else
+			luaL_error(l, "Invalid tool identifier: %s", lua_tostring(l, 3));
+	}
+	else if (!key.compare("selectedr"))
+	{
+		Tool *t = m->GetToolFromIdentifier(luaL_checkstring(l, 3));
+		if (t)
+			c->SetActiveTool(1, t);
+		else
+			luaL_error(l, "Invalid tool identifier: %s", lua_tostring(l, 3));
+	}
+	else if (!key.compare("selecteda"))
+	{
+		Tool *t = m->GetToolFromIdentifier(luaL_checkstring(l, 3));
+		if (t)
+			c->SetActiveTool(2, t);
+		else
+			luaL_error(l, "Invalid tool identifier: %s", lua_tostring(l, 3));
+	}
+	else if (!key.compare("selectedreplace"))
+	{
+		Tool *t = m->GetToolFromIdentifier(luaL_checkstring(l, 3));
+		if( t)
+			c->SetActiveTool(3, t);
+		else
+			luaL_error(l, "Invalid tool identifier: %s", lua_tostring(l, 3));
+	}
+	else if (!key.compare("brushx"))
+		c->SetBrushSize(ui::Point(luaL_checkinteger(l, 3), luacon_brushy));
+	else if (!key.compare("brushy"))
+		c->SetBrushSize(ui::Point(luacon_brushx, luaL_checkinteger(l, 3)));
+	else if (!key.compare("brushID"))
+	{
+		m->SetBrushID(luaL_checkinteger(l, 3));
+		c->BrushChanged(m->GetBrushID(), luacon_brushx, luacon_brushy);
+	}
+	else
+	{
+		//if not a special key, set a value in the table
+		return lua_rawset(l, 1), 1;
+	}
+}
+
 //// Begin Interface API
 
 void LuaScriptInterface::initInterfaceAPI()
@@ -2906,7 +2993,7 @@ void LuaScriptInterface::OnTick()
 	ui::Engine::Ref().LastTick(gettime());
 	if(luacon_mousedown)
 		luacon_mouseevent(luacon_mousex, luacon_mousey, luacon_mousebutton, LUACON_MPRESS, 0);
-	luacon_step(luacon_mousex, luacon_mousey, luacon_selectedl, luacon_selectedr, luacon_selectedalt, luacon_selectedreplace, luacon_brushx, luacon_brushy);
+	luacon_step(luacon_mousex, luacon_mousey);
 }
 
 int LuaScriptInterface::Command(std::string command)
diff --git a/src/lua/LuaScriptInterface.h b/src/lua/LuaScriptInterface.h
index b6e784831..e4f7cb1b2 100644
--- a/src/lua/LuaScriptInterface.h
+++ b/src/lua/LuaScriptInterface.h
@@ -146,6 +146,9 @@ class LuaScriptInterface: public CommandInterface
 	static int fileSystem_copy(lua_State * l);
 
 public:
+	int tpt_index(lua_State *l);
+	int tpt_newIndex(lua_State *l);
+
 	ui::Window * Window;
 	lua_State *l;
 	LuaScriptInterface(GameController * c, GameModel * m);
diff --git a/src/simulation/elements/RPEL.cpp b/src/simulation/elements/RPEL.cpp
index 8fa99d977..70e38830e 100644
--- a/src/simulation/elements/RPEL.cpp
+++ b/src/simulation/elements/RPEL.cpp
@@ -42,7 +42,7 @@ Element_RPEL::Element_RPEL()
 	HighTemperature = ITH;
 	HighTemperatureTransition = NT;
 	
-	Update = &Element_REPL::update;
+	Update = &Element_RPEL::update;
 	
 }