Zombies trapped in body bags, I don´t think is needed, but for the other, zeds with missing limbs, more protected zeds, barbed wire zomibies are cool too, (It can use the same system of spike armors of B42), the heavily decayed zeds were supossed to be in B41, but the system doesn´t actually works, so it can be cool to be added properly, and the know zombies is a great addition too, what can be add to your character background and immersion.