I've actually seen cutscenes in other single player level packs, though. It may be that the ones that come with JJ2 are only customized to work at certain times. I'm pretty sure, though, that custom-built cutscenes work. I'm not definite, however. I've seen it, but not 100% sure how it worked. It *supposedly* works in multiplayer according to what I've heard, but I've never seen one in multiplayer.