Great idea. However, I think that we should lower the amount of zombies if you select the cannon to be off so that you don't die instantly as soon as you spawn. The checkpoint idea might be a good idea for both modes because the zombies can just wait for you to pass and then they will join pursuit. With Sao Paulo, I think that it would also be a good idea if we include open sections like in Fusion to allow you to lure zombies to smash into obstacles, allowing you some breathing room.

Also, is there going to be rubber - band AI for both cannon on and off? I honestly hope not, as there should be an acomplishment to actually outrun the zombies rather than just getting beaten the crap out of.