What about a gamemode schedule?
Allow the host to setup a list of gamemodes to cycle through, which might also go nicely with the map cycle.
For example; one could setup a server that starts on a 2-team DM, when that ends the game is automatically changed to a 2-team CTF, then after is changed to a 2-team Territory, and then it loops back to the DM. Or any other combination of gamemodes; Slayer to Bounty to Boss, etc.
It would probably be easier if the schedule worked by loading favs; that way hosts don't have to setup every desired gamemode by scratch each time, and they can also be edited easier.