I just thought about a gamemode that would be rather interesting to say the least.
2 teams try to kill each other as much as possible in 2 different zones that change every 15 minutes.
First zone is small and in tight spaces great for Assaulters, Flamethrowers, and machine guns, you spawn very close to the point.
Second zone is big and is in a larger area and encourages engineers, snipers, and long range combat, you spawn quite a distance away.
Which ever team gets the most kills in 30 minutes wins.
This mode was designed to encourage multiple playstyles to be used in the same match and for K/D hogs to have a gamemode that fits there way of playing.