Well, I fired up Poser this morning, and using the Hierarchy Editor I found Center of Mass and something called Goal Center of Mass (beneath Body)...but changing their settings doesnt seem to affect the figure the way youve described. So I am flumoxed. But have a look yourself, using Window/Hierarchy Editor...maybe youll see something.

Poser Pro 2014

My personal website: Novels, photos, video, sculptures and more
Evidence of a Lost City: An animated movie and novel, in progress
Hag: A novel and live-action movie