diff --git a/src/namedef.h b/src/namedef.h
index d9d71891e..36a756441 100644
--- a/src/namedef.h
+++ b/src/namedef.h
@@ -270,6 +270,8 @@ xx(MomX)
 xx(MomY)
 xx(MomZ)
 xx(Abs)
+xx(ACS_NamedExecuteWithResult)
+xx(CallACS)
 
 // Various actor names which are used internally
 xx(MapSpot)
diff --git a/src/thingdef/thingdef_exp.cpp b/src/thingdef/thingdef_exp.cpp
index 33ef4e01b..773f7ffac 100644
--- a/src/thingdef/thingdef_exp.cpp
+++ b/src/thingdef/thingdef_exp.cpp
@@ -336,6 +336,18 @@ static FxExpression *ParseExpression0 (FScanner &sc, const PClass *cls)
 	{
 		return new FxConstant(sc.Float, scpos);
 	}
+	else if (sc.CheckToken(TK_NameConst))
+	{
+		return new FxConstant(sc.Name, scpos);
+	}
+	else if (sc.CheckToken(TK_StringConst))
+	{
+		// String parameters are converted to names. Technically, this should be
+		// done at a higher level, as needed, but since no functions take string
+		// arguments and ACS_NamedExecuteWithResult/CallACS need names, this is
+		// a cheap way to get them working when people use "name" instead of 'name'.
+		return new FxConstant(FName(sc.String), scpos);
+	}
 	else if (sc.CheckToken(TK_Random))
 	{
 		FRandom *rng;
diff --git a/src/thingdef/thingdef_expression.cpp b/src/thingdef/thingdef_expression.cpp
index effc897df..426310652 100644
--- a/src/thingdef/thingdef_expression.cpp
+++ b/src/thingdef/thingdef_expression.cpp
@@ -1868,7 +1868,7 @@ FxExpression *FxIdentifier::Resolve(FCompileContext& ctx)
 		newex = new FxCVar(cv, ScriptPosition);
 	}
 	*/
-	// amd line specials
+	// and line specials
 	else if ((num = P_FindLineSpecial(Identifier, NULL, NULL)))
 	{
 		ScriptPosition.Message(MSG_DEBUGLOG, "Resolving name '%s' as line special %d\n", Identifier.GetChars(), num);
@@ -2293,9 +2293,18 @@ FxExpression *FxFunctionCall::Resolve(FCompileContext& ctx)
 		return x->Resolve(ctx);
 	}
 
-	int min, max;
-	int special = P_FindLineSpecial(MethodName.GetChars(), &min, &max);
-	if (special > 0 && min >= 0)
+	int min, max, special;
+	if (MethodName == NAME_ACS_NamedExecuteWithResult || MethodName == NAME_CallACS)
+	{
+		special = -ACS_ExecuteWithResult;
+		min = 1;
+		max = 5;
+	}
+	else
+	{
+		special = P_FindLineSpecial(MethodName.GetChars(), &min, &max);
+	}
+	if (special != 0 && min >= 0)
 	{
 		int paramcount = ArgList? ArgList->Size() : 0;
 		if (paramcount < min)
@@ -2326,7 +2335,10 @@ FxExpression *FxFunctionCall::Resolve(FCompileContext& ctx)
 
 //==========================================================================
 //
+// FxActionSpecialCall
 //
+// If special is negative, then the first argument will be treated as a
+// name for ACS_NamedExecuteWithResult.
 //
 //==========================================================================
 
@@ -2367,7 +2379,15 @@ FxExpression *FxActionSpecialCall::Resolve(FCompileContext& ctx)
 		{
 			(*ArgList)[i] = (*ArgList)[i]->Resolve(ctx);
 			if ((*ArgList)[i] == NULL) failed = true;
-			if ((*ArgList)[i]->ValueType != VAL_Int)
+			if (Special < 0 && i == 0)
+			{
+				if ((*ArgList)[i]->ValueType != VAL_Name)
+				{
+					ScriptPosition.Message(MSG_ERROR, "Name expected for parameter %d", i);
+					failed = true;
+				}
+			}
+			else if ((*ArgList)[i]->ValueType != VAL_Int)
 			{
 				if (ctx.lax && ((*ArgList)[i]->ValueType == VAL_Float))
 				{
@@ -2400,6 +2420,7 @@ FxExpression *FxActionSpecialCall::Resolve(FCompileContext& ctx)
 ExpVal FxActionSpecialCall::EvalExpression (AActor *self)
 {
 	int v[5] = {0,0,0,0,0};
+	int special = Special;
 
 	if (Self != NULL)
 	{
@@ -2410,12 +2431,20 @@ ExpVal FxActionSpecialCall::EvalExpression (AActor *self)
 	{
 		for(unsigned i = 0; i < ArgList->Size(); i++)
 		{
-			v[i] = (*ArgList)[i]->EvalExpression(self).GetInt();
+			if (special < 0)
+			{
+				special = -special;
+				v[i] = -(*ArgList)[i]->EvalExpression(self).GetName();
+			}
+			else
+			{
+				v[i] = (*ArgList)[i]->EvalExpression(self).GetInt();
+			}
 		}
 	}
 	ExpVal ret;
 	ret.Type = VAL_Int;
-	ret.Int = P_ExecuteSpecial(Special, NULL, self, false, v[0], v[1], v[2], v[3], v[4]);
+	ret.Int = P_ExecuteSpecial(special, NULL, self, false, v[0], v[1], v[2], v[3], v[4]);
 	return ret;
 }