Tao, I can't believe I didn't mention this before, probably because I think of this addon as "part" of the game now, but did you look at Robalo's ASR AI? It can run either client or server side and it's really impressive. Suppressive fire, taking cover, AI that will actually engage you with a rifle from more than 100 yards and AI that will not only reload from their backpacks, but reload from other backpacks, or if they completely run out of ammo, they'll go scavenge other weapons.
It might be more than what you were talking about, but it's about one-hundredth the hassle or bulk compared to something like ACE, which no one really seems excited about here (myself, included). Just a simple small .pbo and a config file.