hmm ...
/roleplay a fight for me or not if i happen to like him then i'll give him a beer unless i happen to get pickpocketed then i'll just say hi unless i happen to be under a spell that prevents me from speaking unless beer just happens to be the antidote
....
indeed, why bother using that 3d world or your imagination at all

oh crystal ball, show us the way!
Edit: meaning interaction between players is just more fun then having the program determine the outcome of any (element of) RP.