Here's what i think would be a decent idea. Please reply if you find any issues with it so we can have a concept for the dev's to consider. Initial idea: slow zombies down and have them "patrol" a certain area. Once you out run them they go back to where they originally were. Or that zombies chase you for a certain distance ( no very realistic though ) Pros: There would be no marathons, the loot would remain defended and less noobs would complain about dying to zombies because your given a chance to run away or risk it for loot. Cons: May be difficult with AI (could be wrong), some people may find this unrealistic or too easy.