Also, I think it's a great idea. For example, it can have an usage at OWC/TWC/CWC tournaments, when referee needs to be in blue team. Sometimes, when we write something, we just hit note. Also final resutls for blue team are broken then, lowering their acc by 25%. So that's why referee would join for example green team, and even play with others, if gets bored, and he/she won't broke scoreboards.
Second thing - More teams - more fun.
I fully support it, of course