Would it be possible to add in the ability to once you join your own force, you could perhaps lock it?

I do not know how many teams can be made. However I was thinking if each group of players that were joining/playing on a server, they could make their own little group/team and set it to others not be able to join (but can lock/unlock). Reason for this? If anyone can join my group, what if a jerk player joins and then joins my group and simply starts messing with stuff, and we didn't want him in the team in the first place.