This is a bit tricky to handle. The zombies are generated by your computer and the processing power required to process them all is immense. If we were to add a shitload of zombies, it would become unplayable for most people.
However, there is something you might like. Dynamic Zombie Sandbox is a mission file for the ArmA games (there's even an ArmA 3 version). It's like DayZ in that there are zombies and it uses ArmA, but the zombies are relentless hordes and much more dangerous than their DayZ counterparts. There are even missions and objectives. And there's a post on their website that tells you how to edit the file to increase the number of zombies or anything else you might like.
http://dynamiczombiesandbox.com/Sorry for the late reply, I've been running a music festival for the last eight days and I'm exhausted
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