mcm, jcm, erm - these are just a few of the tech acronyms for controlling the bad joints that poser is currently stuck with. maybe in P7 they'll be better somehow. in the meantime, trying to incorporate those details into a poser animation will probably require an extra team of 5 guys just to handle poser JPs, assuming yer trying to use poser to render a commercially-acceptable animation under a realistic deadline, which is not something I've seen from anyone at this site yet.