I have to agree with you on this.. though G2F has this feature and (at least in my friends version of poser) her boobs are rotated in oposing direction at all times unless you limit her pectoral bones to zero roatation in the parameter editor.  Itried to much about and help fix it, but it seems something is gibbled in the dependancies she imports with via dson

Quote - They got it right with Ryan but totally forgot to add any type of breast deformation/lift/movement when Alyson moves her arms up or down/back or front. I don't understand how something so simple was overlooked and it just annoys the hell out of me. The problem was brought to Miki4 if you select and move her collar parts, the chest is completely unaffected and is another oversight that bugs the crap out of me.

Breast/chest movement when arms are moved should be a no-brianer, so why are the newer figures not including these movements?

I don't have the newest PP to test Roxie so I have no clue if she's missing the movements or not.