The problem is that you have two poses, one at .15 and the other at -.17 and it sounds like it should be easy to make the hip drop down by .32.  However, that would only work if the two poses are applied back to back.  How do  you account for a third pose that may have moved the hip to say .04?  Or what happens when I put the figure on a box that moves the hip up by say .80?  Where does the kneeling pose move to?  The top of the box or the ground putting it inside the box.  Either you set the pose to move back to a set location normally 0.0.0 Or you let it float as it is in space.  Trying to make it so that you don't have to move the figure afterwards means that it locks it to a very specific set of conditions and it would be pointless to most people.  Your first poses that returned the figure to the center of the scene is an example of that. A pose is suppose to move a figure into a set position, after that then it has to be set by the user to face forward backwards or tilted or any other set of combinations you  cannot even begin to hope to think of.

Poser 5, 6, 7, 8, Poser Pro 9 (2012), 10 (2014), 11, 12, 13, 14