If you ever intend to tie morphs and gravity effects to a figure automatically, using the hip for physical location will mess this up. hip rotations should be used to orient the figure to gravity. hip trans - are useful in animations - if the IK are on. BODY rotations and trans are meant to locate a figure on stage. It looks as though the original programers expected pose files to save a generic body pose and PZ3 files to save the scene setup. They probably did not imagine a pose file being use the set a scene, so they left BODY channels out of a pose file. As has been said, it is easy to hack BODY rot/trans into a pose file - as long as there is a slot made for them. hip rotations and trans being used hapazardly is the rule. When running through a series of poses - using the front camera to view for example - the hip should remain at zero twist - as if skewered - and above and below wriggling and rotating back and front and/or side-side as the pose dictates. This is very rare. I have gravity JCM that are controlled by hip rotations, so they must be used reproducibly. The Poser 5 demo shows effects that may require that the figure be done in this way - to be able to tell where up and down are for the figure. If so, a whole lot of legacy poses will not be usable unless edited.