It would be nice to be able to play coop in all game types. I'm running a custom coop server & it gets boring playing the same game mode all the time. I really like push because it's similar to checkpoint but runs the maps completely different. I wouldn't think it would be too difficult to add a bool to each game mode to put all human players on one team "bcoopmode=True" in each game setup in the game.ini file to allow servers to play multiple game modes in coop.