Smarter more aware zombies (and skeletons), they track you down via blood scent, sound, and light source awareness, config lets you pick and choose what features to have.
I don't personally have anything against this mod, it's really about trying it out and seeing if it works.
http://coros.us/mods/zombieawareness
I don't personally have anything against this mod, it's really about trying it out and seeing if it works.