It looks like the problem with the feet penetrating the ground may be inherited from (at least some of) the P4 pose files. 

Any adjustment to how far apart the legs are is a fairly easy tweak, modifying the seed pose from which the bias values for the script are being derived.  Currently I've tried to line up the innermost points of Antonia's feet with those on Posette.  That ignores any difference in alignment of the legs, however, so it could create trouble in the knee area.  Ideally, the joint center for Antonia's feet should be aligned as well as possible with the joint center for Posette's feet.  I'll try setting that up.

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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.