TheRussian

The game engine that ARMA 2 is running on is what is "hard coded", meaning that it literally cannot be changed without remaking the entire engine or a significant portion of it. The mod does nothing to this architecture and frankly can't change much at all. The zombies are simply soldiers that have no guns and are dressed like civilians in terms of "coding" in the game. The zombies are going to run around very silly-like for pretty much the end of time unless there is some incredibly heavy scripting in the mission, which probably won't do much anyways.