I got inspired by Saints and Sinners, where with some bladed weapons, you could cut off enemies heads and display them in on your weapon rack back at base. I think something similar could be done for pz, where if you're using a long blade weapon, there's a chance that you could decapitate a zombie/player, with the chance increasing with each level of strength you have. I think it could work wonderfully for rp, as cutoff heads could be used by people rp-ing as raiders, for obvious reasons. it would also bring more incentive to use long blade, as everyone likes a good trophy, and long blades are not often used in everyday pz.