Specific team-mates; random opponents in Instant Action

Hi
I recently started playing UT2004 and I've almost finished Single player mode.
I'd like to play the instant action mode with team-mates of my choice but my opponents should be chosen by the game to balance the number of my team.
Is that possible?

Currently the only options I see are to choose both mine and opponent's team from the bot roster, or I can choose the number of bots and the game will automatically fill up both teams. I need something in-between.

Thanks for the replies, guys.

Benfica, no I'm not looking to play with uneven number of bots. It's going to be me and 4 of my chosen bots in the Blue team, game can fill up the Red team with 5 bots of it's choosing. So it's 5 vs. 5.

"addredbots 5" gives a message of "Unrecognized command". So I looked for other similar commands and "addbots 5" works.

So now I start a game with me and 4 bots of my choosing in the blue team, and immediately type "addbots 5" in the console, that adds 5 bots to the Red team automatically. Thanks a lot.

AlCapowned, I've downloaded the mutator, but I haven't tried it yet. Ideally I would like to have the game fill up the opponent bots and also allow me to configure the roles of my team-mates before the game begins, just like in the single player ladder. If this mutator can do that it'll be great. I'll check and post here.

Update: No, the mutator is for having more bots than players or something like that. Not what I'm looking for. But addbots command works.