*Actually, you just described how I intended it to work (mimicing the functionality of your python code), so if it's not doing that, I'll have to look at it again.

*I found it to be returning the index of the vertex itself, which isn't a big deal.  I just wrote something to screen that out.  The screened lists weren't giving me all the desired neighbor polys, so I stopped messing with it and just adapted the old function for Mesh use.  There is a chance that I erred while screening the index of the vert and ended up somehow screening valid neighbors as well.  I don't think I did, but it is always much more likely that Cage goofed, when something like this comes up....  :-P 

Not a biggie.*

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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.