New filter catagory

Maybe this would be better in the development forum but is it possible to add another catagory? I was thinking something like [Friends] & [Enemies] which would act similar to the hunting catagory - flashing circle or similar. My thinking is we all have friends who run Anon/Roleplay a lot and it would be good to know when they are actually in your zone. Also there are players that get to you for one reason or another that you just want to stay clear of. Player tracking isn't great because of the way the server sends info so this wouldn't provide anymore info than in-game tracking.

Opinions?