[Maleficus]

What your describing would actually already be possible with the SP game with creative mapping and scripting. IIRC, some mapper was going to make a map that used the SP A.I. but simulated a MP game. I don't if that map was ever released, but it was a very ambitious project.

Right now, its easy to stack the teams and have a bunch of axis bots, and only humans on allies (as an example), you just need to add the bots by name (check out the botindex.txt file to see the diff bot names).