My comment was intended to be encouraging Spanki. I can't own to being a whiz when it comes to rigging in poser yet Spanki. My rigging knowledge comes from other applications, primarily Maya. However, If I do come up with something I'd be more than happy to share it.
I don't know about grouping the bone to a material group, but you could create more groupings to include breasts, nipples, ears, and things like that, and create bones for them. They could serve as guide bones for area specific motion (ears stick out, bend, Breasts rotate, swing, so forth). You could make ghost bones for even more control, and set up erc dials for them.