I posted the link because Phantom3d is already taking Poser rigging in other directions from the standard fare available with the rigging setups that deal with the groin/hip/thigh area through the addition of the secondary hip and therefore might find the information useful or thought provoking.

However, please correct my abysmal ignorance and direct me to the pertinent Poser information to correct the shoulder deformation deficiency when posing figures with arms extended overhead.

It seems all my Poser characters suffer from this so I'm sure that others besides myself would find the information revealing, such as the creators of this figure, Smith Micro, DAZ, and the plethora of figure creators.

Thank you and I eagerly await the solution outlined by you as "anything that can't (or hasn't) already been done in Poser, using Poser methods of acheiving it."