The Python version discussion is why I would recommend JavaScript for the tools, ODF.  I have a similar problem with the late, lamented MetaForm:  it works reasonably well in Poser 6, but because Poser 7 switched Python versions, it dies.  And I'm up to Poser Pro 2010 and hoping to upgrade.

I'd hate to see a wonderful tool suddenly go belly-up just because the Python version changes.  And it will change; we know that.

I also think that your mesh tools would be very useful as a commercial product to developers.