More on the "popping knees" problem.  I'm wondering if this could relate to the default handling of the leg IK chains.  There's a trick which allows you to define which way the joint will bend with IK, but I don't remember how it works.    I think it has something to do with memorizing the figure state in the correct pose, rather than setting joint bending limits.

Does anyone recall how to do that?

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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.