Syntax color for "label" in ANTLRWorks

One of my frequent mistake using ANTLRWorks is that I always forget the $ prefix of the labels.  By changing the syntax color setting and change the default black color for "labels" would help remind me of that.  

But the rule arguments and return values aren't yet recognized as "label" though they need a "$" prefix as well.  If these variables can be highlighted, that would be more helpful.