I've got a crazy idea: how about more zombies? Eh? When you log in and see there's only 18 zombies at the moment you're not really worried about them. Right now the biggest threat in the map isn't the infestation - it's the other players. So instead of 18 make it 18,000, and put them all over the map - not just chilling in the towns. Put 50 zombies right next to the can of beans. So the only way to get fed is to bring in more people with guns - or have somebody play chicken and lure the corpses away. Force people to stop shooting each other and band together to survive. Just my idea. Whatever. No one cares.