Would you have to consider the real number of joints in the human body or just the "lthigh" "rshin" "neck" etc. type that coorespond to the poser dials? It might have to be a seperate program outside of poser, one that would calculate all the data from the postions of the body from the inital pose and then set that at "default" position. I don't think this physical figure thing would be good for trying to do "motions", more just setting the keyframes and letting poser do the work. If you were doing it step by step stop action style, one little movement at a time, your basically duplicating what you could already do with more accuracy in poser with the dials.