Is there any way (or is there a current model which supports it) of getting the skeletal figures to move correctly in the shoulder region?

Elevating the Humerus (referred to as the shoulder in poser) does just that - only the humerus moves.

In real life the scapula should move also.  I am creating animations to show different aspects of my work (Sports Therapy) and the scapulo-humeral rhythm (no, it's not the latest track by Travis!) is important.

I'd like to be able to show the correct scapula movement, and the clavicle as well if possible without having to chop things up (the clavicle should elevate and rotate during the movement of the humerus)

Any ideas?