I dont believe this "world stimulator*" thingy. Lamo and unnecessary, just loads npc's, mobs, zone by zone. Their freaking monseters they walk, they sleep, they eat. Gothic II does that and I think Gothic I and its fine. Just bump up the npc, specific npc behavior and you got Stalker in a bottle.
Hahahaha. Aside from your absolutely abysmal grammar, it's ridiculously obvious that you've never even bothered to learn about the complexity of a good A.I. system. It's fucking tough. Hell, Black and White's creature A.I. had an programmer entirely dedicated to JUST THAT, the second B&W was said to have a team of A.I. programmers working on various A.I. systems for the various creatures.
It's not like programmers just throw together a set of legos and say "Oh-ho, A.I!" Though, in all honesty, I think some of DOOM 3's enemies were created that way.