I think it would be fun to add a gametype where you play Team Deathmatch with zombies roaming about the map.
There would be no points for killing zombies, but the zombies are obviously going to be trying to kill you which could be very distracting.
All normal killstreaks would be disabled, instead being replaced by a scorestreak setup that would make the zombies more inclined to ignore your teammates and attack the other team. They could also have streak bonuses that gave you individual zombie immunity for 15 or 30 seconds. The zombies would have to have low hit points like they do on the first wave because there wouldn't be any perka-colas or a pack-a-punch machine.
This mode wouldn't affect your combat record because if it did people would abuse it to boost their stats.
Any thoughts or ideas? I know it would never happen unless it was a paid DLC, but we can always dream.
http://i.imgur.com/EMWsl.jpg http://gifsoup.com/view6/4081352/wheelie-o.gif <---My Bike TWSSted since~ 3/27/12