they should add another difficulty to cabin fever. heres what would be changed from extreme:
-Infected dogs start appearing at round 25
-At round 30, the timer stops, and infected will keep spawning until the game ends. the objective is to get to the top right of the map and escape (at this point, you can go far outside the house). everyone alive must go to the end point for the game to end.
Those are my 2 favorites. However, the dogs would make it seem even more like a rip off of CoD... I really like the idea of having to run to the chopper. It would be much better than that cutscene.