One problem with saving body rotations, you will be changing the location that the body is placed by the artist. The best method is to not move the body from the standard location for poses and do all rotations using the hip. Now if this is a pose set to fit a scene (like a guy sitting on that stool at the bar) you will have to add the changes to the pose file for the body. This is the only instance where the body should be moved from it's standard location.