The point is that zombies are easy to kill and barely mentioned in the RP. This is why all these other threats were created, when instead the zombies should have been the thing to change.
What I would change:
Better zombies
-slow moving
-very fast at killing
-not too hard but not too easy to kill
Better placement
-I've never seen a zombie on the east side of the pipe... There should occasionally be some
-The zombies in the town should probably be moved so they're centered around the truck. This would make the town much more dangerous and you'd have to be much more careful.
-The witch in the medical center is pointless
-Zombies are much more of a threat on flat ground. In places such as the canyon pass or the ravine, they're pretty easy to escape/kill because they have to jump to get to you. Minimizing this would be good, maybe flattening out the ravine bottom, and disabling zombie jumping.
Also, we should stop complaining so much until we see the update.