diff --git a/src/d_iwad.cpp b/src/d_iwad.cpp
index 29c3ea98b8..d263ba0734 100644
--- a/src/d_iwad.cpp
+++ b/src/d_iwad.cpp
@@ -348,13 +348,6 @@ int FIWadManager::CheckIWADInfo(const char *fn)
 					FIWADInfo result;
 					ParseIWadInfo(resfile->Filename, (const char*)lmp->CacheLump(), lmp->LumpSize, &result);
 					delete resfile;
-					for (auto &wadinf : mIWadInfos)
-					{
-						if (wadinf.Name == result.Name)
-						{
-							return -1;	// do not show the same one twice.
-						}
-					}
 					return mIWadInfos.Push(result);
 				}
 				catch (CRecoverableError &err)
@@ -519,28 +512,39 @@ int FIWadManager::IdentifyVersion (TArray<FString> &wadfiles, const char *iwad,
 
 	if (iwadparm)
 	{
-		// Check if the given IWAD has an absolute path, in which case the search path will be ignored.
-		custwad = iwadparm;
-		FixPathSeperator(custwad);
-		DefaultExtension(custwad, ".wad");
-		bool isAbsolute = (custwad[0] == '/');
+		const char* const extensions[] = { ".wad", ".pk3", ".iwad", ".ipk3", ".ipk7" };
+
+		for (auto ext : extensions)
+		{
+			// Check if the given IWAD has an absolute path, in which case the search path will be ignored.
+			custwad = iwadparm;
+			FixPathSeperator(custwad);
+			DefaultExtension(custwad, ext);
+			bool isAbsolute = (custwad[0] == '/');
 #ifdef WINDOWS
-		isAbsolute |= (custwad.Len() >= 2 && custwad[1] == ':');
+			isAbsolute |= (custwad.Len() >= 2 && custwad[1] == ':');
 #endif
-		if (isAbsolute)
-		{
-			if (FileExists(custwad)) mFoundWads.Push({ custwad, "", -1 });
-		}
-		else
-		{
-			for (auto &dir : mSearchPaths)
+			if (isAbsolute)
 			{
-				FStringf fullpath("%s/%s", dir.GetChars(), custwad.GetChars());
-				if (FileExists(fullpath))
+				if (FileExists(custwad)) mFoundWads.Push({ custwad, "", -1 });
+			}
+			else
+			{
+				for (auto &dir : mSearchPaths)
 				{
-					mFoundWads.Push({ fullpath, "", -1 });
+					FStringf fullpath("%s/%s", dir.GetChars(), custwad.GetChars());
+					if (FileExists(fullpath))
+					{
+						mFoundWads.Push({ fullpath, "", -1 });
+					}
 				}
 			}
+
+			if (mFoundWads.Size() != numFoundWads)
+			{
+				// Found IWAD with guessed extension
+				break;
+			}
 		}
 	}
 	// -iwad not found or not specified. Revert back to standard behavior.
diff --git a/src/p_actionfunctions.cpp b/src/p_actionfunctions.cpp
index 1a3333bdd5..0cb4e98493 100644
--- a/src/p_actionfunctions.cpp
+++ b/src/p_actionfunctions.cpp
@@ -6765,7 +6765,7 @@ DEFINE_ACTION_FUNCTION(AActor, A_CheckTerrain)
 DEFINE_ACTION_FUNCTION(AActor, A_SetSize)
 {
 	PARAM_SELF_PROLOGUE(AActor);
-	PARAM_FLOAT(newradius);
+	PARAM_FLOAT_DEF(newradius);
 	PARAM_FLOAT_DEF(newheight);
 	PARAM_BOOL_DEF(testpos);
 
diff --git a/src/p_mobj.cpp b/src/p_mobj.cpp
index e27ab198c0..21126f645b 100644
--- a/src/p_mobj.cpp
+++ b/src/p_mobj.cpp
@@ -8317,15 +8317,15 @@ DEFINE_ACTION_FUNCTION(AActor, Vec2To)
 {
 	PARAM_SELF_PROLOGUE(AActor);
 	PARAM_OBJECT_NOT_NULL(t, AActor)
-		ACTION_RETURN_VEC2(self->Vec2To(t));
+	ACTION_RETURN_VEC2(self->Vec2To(t));
 }
 
 DEFINE_ACTION_FUNCTION(AActor, Vec3Angle)
 {
 	PARAM_SELF_PROLOGUE(AActor);
 	PARAM_FLOAT(length)
-		PARAM_ANGLE(angle);
-	PARAM_FLOAT(z);
+	PARAM_ANGLE(angle);
+	PARAM_FLOAT_DEF(z);
 	PARAM_BOOL_DEF(absolute);
 	ACTION_RETURN_VEC3(self->Vec3Angle(length, angle, z, absolute));
 }
diff --git a/src/scripting/thingdef_data.cpp b/src/scripting/thingdef_data.cpp
index 09e28ba556..4560b282ef 100644
--- a/src/scripting/thingdef_data.cpp
+++ b/src/scripting/thingdef_data.cpp
@@ -1204,8 +1204,8 @@ DEFINE_ACTION_FUNCTION(FStringStruct, AppendFormat)
 DEFINE_ACTION_FUNCTION(FStringStruct, Mid)
 {
 	PARAM_SELF_STRUCT_PROLOGUE(FString);
-	PARAM_UINT(pos);
-	PARAM_UINT(len);
+	PARAM_UINT_DEF(pos);
+	PARAM_UINT_DEF(len);
 	FString s = self->Mid(pos, len);
 	ACTION_RETURN_STRING(s);
 }
diff --git a/wadsrc/static/language.enu b/wadsrc/static/language.enu
index da16d83e44..d7da664e1d 100644
--- a/wadsrc/static/language.enu
+++ b/wadsrc/static/language.enu
@@ -579,7 +579,6 @@ NERVETEXT =
 	"\n"
 	"THIS RIDE IS CLOSED.\n";
 
-
 // Cast list (must appear in this order)
 CC_ZOMBIE = "ZOMBIEMAN";
 CC_SHOTGUN = "SHOTGUN GUY";
@@ -1299,7 +1298,6 @@ TXT_IMITEMS = "ITEMS";
 TXT_IMSECRETS = "SECRETS";
 TXT_IMTIME = "TIME";
 
-
 RAVENQUITMSG = "ARE YOU SURE YOU WANT TO QUIT?";
 
 // Hexen strings
@@ -1459,7 +1457,6 @@ TXT_MAULER = "You picked up the mauler.";
 TXT_GLAUNCHER = "You picked up the Grenade launcher.";
 TXT_SIGIL = "You picked up the SIGIL.";
 
-
 TXT_BASEKEY = "You picked up the Base Key.";
 TXT_GOVSKEY = "You picked up the Govs Key.";
 TXT_PASSCARD = "You picked up the Passcard.";
@@ -1567,6 +1564,7 @@ TXT_GOAWAY			= "Go away!";
 TXT_COMM0			= "Incoming Message";
 TXT_COMM1			= "Incoming Message from BlackBird";
 
+TXT_TRADE			=  " for %u";
 
 AMMO_CLIP			= "Bullets";
 AMMO_SHELLS			= "Shotgun Shells";
@@ -2471,12 +2469,10 @@ OPTSTR_NOINTERPOLATION		= "No interpolation";
 OPTSTR_SPLINE				= "Spline";
 OPTSTR_OPENAL				= "OpenAL";
 
-
 NOTSET				= "Not set";
 SAFEMESSAGE			= "Do you really want to do this?";
 MNU_COLORPICKER		= "SELECT COLOR";
 
-
 WI_FINISHED			= "finished";
 WI_ENTERING			= "Now entering:";
 
@@ -2852,7 +2848,6 @@ DSPLYMNU_TCOPT		= "TrueColor Options";
 
 TCMNU_TITLE		= "TRUECOLOR OPTIONS";
 
-
 TCMNU_TRUECOLOR				= "True color output";
 TCMNU_MINFILTER				= "Linear filter when downscaling";
 TCMNU_MAGFILTER				= "Linear filter when upscaling";
diff --git a/wadsrc/static/language.fr b/wadsrc/static/language.fr
index 9731033278..fa49cc07eb 100644
--- a/wadsrc/static/language.fr
+++ b/wadsrc/static/language.fr
@@ -1646,6 +1646,8 @@ TXT_GOAWAY			= "Allez-vous en!";
 TXT_COMM0			= "Message reçu.";
 TXT_COMM1			= "Message reçu de BlackBird";
 
+TXT_TRADE			=  " pour %u";
+
 AMMO_CLIP			= "Balles";
 AMMO_SHELLS			= "Cartouches";
 AMMO_ROCKETS		= "Roquettes";
diff --git a/wadsrc/static/zscript/actor.txt b/wadsrc/static/zscript/actor.txt
index a7f76f348f..bec97eda33 100644
--- a/wadsrc/static/zscript/actor.txt
+++ b/wadsrc/static/zscript/actor.txt
@@ -1145,7 +1145,7 @@ class Actor : Thinker native
 	native bool A_CopySpriteFrame(int from, int to, int flags = 0);
 	native bool A_SetVisibleRotation(double anglestart = 0, double angleend = 0, double pitchstart = 0, double pitchend = 0, int flags = 0, int ptr = AAPTR_DEFAULT);
 	native void A_SetTranslation(name transname);
-	native bool A_SetSize(double newradius, double newheight = -1, bool testpos = false);
+	native bool A_SetSize(double newradius = -1, double newheight = -1, bool testpos = false);
 	native void A_SprayDecal(String name, double dist = 172);
 	native void A_SetMugshotState(String name);
 
diff --git a/wadsrc/static/zscript/base.txt b/wadsrc/static/zscript/base.txt
index 2ebeba421a..6faba67059 100644
--- a/wadsrc/static/zscript/base.txt
+++ b/wadsrc/static/zscript/base.txt
@@ -671,31 +671,31 @@ struct StringTable native
 // Most are handled at load time and are omitted here.
 struct DehInfo native
 {
-	native int MaxSoulsphere;
-	native uint8 ExplosionStyle;
-	native double ExplosionAlpha;
-	native int NoAutofreeze;
-	native int BFGCells;
-	native int BlueAC;
+	native readonly int MaxSoulsphere;
+	native readonly uint8 ExplosionStyle;
+	native readonly double ExplosionAlpha;
+	native readonly int NoAutofreeze;
+	native readonly int BFGCells;
+	native readonly int BlueAC;
 }
 
 struct State native
 {
-	native State NextState;
-	native int sprite;
-	native int16 Tics;
-	native uint16 TicRange;
-	native uint8 Frame;		
-	native uint8 UseFlags;	
-	native int Misc1;
-	native int Misc2;
-	native uint16 bSlow;
-	native uint16 bFast;
-	native bool bFullbright;
-	native bool bNoDelay;
-	native bool bSameFrame;
-	native bool bCanRaise;
-	native bool bDehacked;
+	native readonly State NextState;
+	native readonly int sprite;
+	native readonly int16 Tics;
+	native readonly uint16 TicRange;
+	native readonly uint8 Frame;		
+	native readonly uint8 UseFlags;	
+	native readonly int Misc1;
+	native readonly int Misc2;
+	native readonly uint16 bSlow;
+	native readonly uint16 bFast;
+	native readonly bool bFullbright;
+	native readonly bool bNoDelay;
+	native readonly bool bSameFrame;
+	native readonly bool bCanRaise;
+	native readonly bool bDehacked;
 	
 	native int DistanceTo(state other);
 	native bool ValidateSpriteFrame();
diff --git a/wadsrc/static/zscript/menu/conversationmenu.txt b/wadsrc/static/zscript/menu/conversationmenu.txt
index 8d05ee4baa..3474753e8f 100644
--- a/wadsrc/static/zscript/menu/conversationmenu.txt
+++ b/wadsrc/static/zscript/menu/conversationmenu.txt
@@ -137,7 +137,7 @@ class ConversationMenu : Menu
 			mShowGold |= reply.NeedsGold;
 
 			let ReplyText = Stringtable.Localize(reply.Reply);
-			if (reply.NeedsGold) ReplyText.AppendFormat(" for %u", reply.PrintAmount);
+			if (reply.NeedsGold) ReplyText.AppendFormat(Stringtable.Localize("$TXT_TRADE"), reply.PrintAmount);
 
 			let ReplyLines = SmallFont.BreakLines (ReplyText, ReplyWidth);