I'm just thinking what if you add some zombie encyclopedia. Where zombie's description, looks like and type will be in it. I'm pretty sure this doesn't really add anything up in the game. Still as a pve player and doing bounty, it's pretty confusing on what kind of zombie you're searching since some zombie do looks a like.
There are also those times that in 3+ maps I wouldn't even kill the type of zombie that I need. Idk if i'm suffering from a bug or what, but I literary have zero idea on what type of zombie I am searching for.
I do know walkers and runner though.