I thought I'd read that one should use collar Twist, rather than shoulder Swing, in order to avoid unsightly creases in the upper arm region.  If I try to pull the arms back, however, using the Twist rather than the Swing, the upper part of the shoulder, at the back, collapses.  This isn't as pronounced with Swing in use.  So I'm wondering if there is a posing "rule" for area.

Maybe I just misunderstood the rule about avoiding Bend + Swing > 90? 

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Cage can be an opinionated jerk who posts without thinking.  He apologizes for this.  He's honestly not trying to be a turkeyhead.

Cage had some freebies, compatible with Poser 11 and below.  His Python scripts were saved at archive.org, along with the rest of the Morphography site, where they were hosted.