Hi, My suggestion is that when you do /map that you actually see the players that have supporters in there color. Now you only see players but it doesn't indicate if you are a supporter or not.
I don't see any specific advantages of adding this either, it doesn't really matter - I don't mind if it's added or not, it's just not a necessity as of now
It doesnt really have a purpose, most likely you'll have map up when your game is running, if you want to see that, go back to MC, press Tab -1