@odf: That's pretty much what I was proposing, before we moved to this new thread.  The Walk Designer poses do contain translation keyframes for the Hip actor, so it was hoped that this meant the Walk Designer wasn't hard-coded to apply translations to any actor named "Hip".

To test this, I ran your script on the set of Poser 4 walk cycle poses, re-naming Hip to Waist.  I pasted these into the Runtime:Libraries:Pose:Walk Designer folder.  I then tested using these on two versions of the GitHub Antonia 1.0.1 build, one with Hip translations forced to zero, the other with those limits removed.  In the former case, there were no undersirable Hip translations on Y, but the walk cycle was rigid and robotic, with the Waist actor not being translated on Y either.  In the latter case, the Hip actor was translated on Y, as seen previously.  These results were the same as those I could achieve using walk cycle poses which hadn't been converted for Antonia 1.0.1.

So it looks like the pasted-in walk cycle poses made no difference at all.  My tests, however, were not carefully applied, and I'm not experienced with the Walk Designer.

Loading poses into the Walk Designer pose folder should do just as you hoped, above, and as markschum suggests.  The new poses should allow for properly-calibrated results for a non-standard figure rig.  The poses need to be designed for the figure, however.  Unfortunately these poses don't seem to play any role in determining which actor is translated on Y during the walk animation.

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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.