1. The weight map IDs can be duplicated in several actors, since one map can spread over any number of actors.

2. Correct.  Poser will carry around deactivated weight maps, which can be safely removed from the file.  If a map number is not referenced by a joint in the channels section, it is inactive.  Somewhere I have a script which will remove these.

3. Most weight map IDs are numeric, and Phil has an excellent guess about how those numbers are being generated.  That's been a mystery.  Woo hoo, PhilC!  :woot:  The weight maps for these are what the user defines in Poser, using the joint editor.  The non-numeric map names are bulge maps, and Poser's bulge map naming methods are bizarre.  I have seen many different bulge map naming formats over the past several months and I'm not sure how Poser determines what naming to use for these.

4. I'm sending you a PM.  :D

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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.