Ummm, suicide zombies would be ridiculous, even for this thread. No, suicide bomber is a trait that can be applied to any zombie. “yYou stab the child zombie with your flammeschwert, it explodes, you die” “The zombie hulk steps on a landmine, You hear an explosion in the distance, you are killed by nuclear fallout”.
And there should be hydroponic farms, but instead of plants, there are fresh corpses hangiing all over, being fertilised and watered. And there should be friendly static N.P.C.s that spawn there, with very good equipment and skills, and loads of useful stuff to sell and nice quests, and they are just hanging around, innocent as can be, your best friends in thewhole cataclysm…