Either there's way to do this in the sand box mode already and I'm missing it or, it's not possible yet and it's something that I would like to be able to do in GCII.
Since it's a single player game I've compared it to other games I play as SP in sand box mode. What I find I would like to have in GCII is a means of having locked teams with victory conditions available on a team basis. So far this only shows up in Campaign mode and not in sand box mode at least as far as I can see.
So would others like to see this feature. I know I would.