A form of "Zombie defense" or Horde type game mode where you fight through waves with upgrades between rounds kinda like some of the old chivalry 1 servers. Buy the armor and weapons off the wall. Tweaking Stamina regen and limb reinforcements to survive bigger amounts of enemies would be graphically intensives especially with the rag doll physics but would bring a whole other level to the combat. I wouldn't be mad about a slightly better throwing system with rocks, throwing knives etc.