Even if there was nothing of the sort in single player, that would have been so great. My fondest memories of any online FPS game was predator mode in FCIP, I played that game more than any game ever for the online predator matches. So fun. And with how awesome the map editor is now, we could make some damn awesome horror maps for it.
Sidenote: I've been reading on here that you can't place vehicles in maps you make. Is that true? Was that a mistake that's going to be patched, or did they really think that was a good idea?