i agree all the way!!! this cheat is good but it would even better to do it with a friend.
also many people who i have spoke to on xbox live have said they would only buy sr3 if the zombie cheat was coop (they were people who enjot zombie games, and dont really play sr games)
also if they did allow this cheat to go coop then they would acctually make a very good unique cheat/game
i havent played any zombie game/cheat were you get to go round a open world killing zombies and free roaming in a city/suburban area
please listen to the players and just make it go coop