Quote: "NPCs in this are too high-poly for FPSC they insanely drop game's framerate. "
I use Characters that are around 10000 polygons and no slowdowns at all. After experimenting a very long time, I have noticed that FPSC is more script-sensetive than other game engines...
Quote: "Is there any way to use their AI on Model Pack 1 soldiers, for instance?"
Well, the other way around works fine so with some tweaking perhaps..
I just dont see why You want the MP53 AI-scripts so badly, not mutch better than vanilla scripts. (They just need to be modified!)