This is a great help, svdl.  Thank you.  :)  And, no - you haven't confused me... too much.  I can make sense of it, so far.  I think.

I've been wondering whether trying to use x-mirroring for centered meshes would really reduce the process at all.  I'd still need to hunt through the geometry sets to find the symmetrical index, but I assume that would be faster and less intensive than running the comparison checks for everything.

I'm really frustrated with PoserPython.  Perhaps Blender Python spoiled me, but I kind of expected more (and more useful) internal functions for geometry handling.  If I didn't need to see quick test results as I go along developing, I think I would rather create this as a standalone for Python 2.4+.  I could probably gather all the information I need and organize it with a single parsing of each .obj file.  It seems to me that this would be faster.  Hmm.

I'll post this as it develops.  I'm just silly enough to think this is some kind of big breakthrough in morph-handling.  :-P  Maybe I should sit down and catch my breath.

===========================sigline======================================================

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.