Have you guys ever played custom WaW zombies using the ugx mod? The mod had several new game modes in it and two of which were absolutely perfect. The two I am talking about are Timed and Sharpshooter. Timed was exactly the same as zombies is now but there are no rounds and the zombies just kept on constantly coming (Like no mans land on moon), when you die it tells you how long you lasted in minutes not rounds. Sharpshooter was the same as it is in multiplayer, every 45 seconds you where given a new gun to use. Perks were obtained from not getting hit while getting kills for a certain amount of time so buying perks and guns was disabled. If Treyarch could do this I would be impressed.