Couldn't you do that with the CTF mod by justmaking 2 teams but only placing 1 flag?
As of now, the CTF mode ends upon one team reaching a score, not a time limit.
Nick, that is what I think that he was saying.
Maybe it'd be more like bacon, two teams are working for one flag in the center of the map, and they have to bring it back without dieing or it getting stolen by the enemy team.
Can someone make a one flag CTF which is basically capturing a flag and taking it to the enemy's side to get a point for your team.