seems basicaly like teams to me... player made teams
I don't really see what it does. Does it stop them from team killing each other?
How about a system that would allow you to set who you would like to be incapable of damaging?
That seems it could get a little bit abusive if not done right.
But then of course, you could have the team that everyone joins and kills the 3 other people not on it.
That's why there would be an RTB pref to limit the amount of people on a team.