Here's an update on the UV script.  This one can create a new actor with a geometry which has the altered UVs.  Weld and split both seem to be working in my tests.  The interface now has zoom and pan options and can display out-of-range UVs.  Back-facing poly detection now runs as you work, and is much faster - but it misses some cases, apparently because it's only using the first three verts in the poly to test the normal direction.  The basic handling is as outlined in my previous post.

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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.