Great stuff!
I know that this is not much of a contribution, but since the modding elite is gathering in this thread, I just can't pass up to toss you this idea:
What about a gametype thats, say, basically the standard KF, but on a very large map, where 2 spots have to be defended King of the hill style? So you don't only have to survive, but also have to keep Zeds out of a certain area? (room filled with refugees, whatever.)
The huge map could inspire/force (whichever way you look at it
) people to use the chopper to transport one or two players once in a while to where the s*** hits the fan...
Say the Waves spawn with a random emphasis, like 5 out of 6 Zeds spawn at HotSpotA, next round at HotSpotB, and players have to ferry everybody but a single guard to the battle at hand...
Again, since I can't contribute to anything, I just thought I'd tell you what you made me dream of at night with this outstanding chopper in particular.