Regarding the material zone numbers...

Quite right - my decision to use material names as object attribute names in matmatic was not forced. In the end, it was fairly straightforward to add a mapping rule. Any material zone name beginning with digits follows by an underscore are now handled correctly by matmatic (the copy I have, not the copy you guys have) I simply ignore the digits and underscore.

With VSS, no name restrictions exist. You can entirely use punctuation, for all I care.  However, having sensible keywords within the name helps VSS a lot to auto-sense what the zone is for. For example, a few figures tricked me (and VSS) with names like Gland. That is skin. If it had been called GlandSkin, VSS would have worked automatically even if I had never seen the "Gland" part before.

DId I see a zone for fingernails and a zone for toenails in the last posting or not? I think some people may want to be able to have different colors there.

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Renderosity forum reply notifications are wonky. If I read a follow-up in a thread, but I don't myself reply, then notifications no longer happen AT ALL on that thread. So if I seem to be ignoring a question, that's why. (Updated September 23, 2019)