Quote - Those values are not used unless the addon is installed. If you want to remove them you must edit the pz3 file with a text edit, do not use a word processor, while Poser is not running. That is fundamental. If you have Poser running then the values have been loaded in memory. 
Close Poser, edit the file and you'll be all set.

I use the Poser File Editor to strip the references from the preferredState.pz3, as well as the .pz3 files I intend to use which had the Add-on references embedded.  I do this while Poser is closed.  I check and re-check the preferredState.pz3, finding that the Add-on listing at the bottom of the file is, indeed, gone.  Yet when I re-open Poser... there the Add-on is, still in the menu.  When I click on the menu listing, it still opens.  No change, essentially.  The persistence of the menu listing, which is presumably what's causing the Add-on to keep being added to every single .pz3 I save, seems completely de-linked from the preferredState.pz3 or any other .pz3 file.  Poser is remembering it somehow.  I can't seem to get rid of the thing, and I don't want to uninstall it from the previous version.

Seems like Poser's trying to do my thinking for me, but, in typical Poser fashion, the thinking it imposes is a bit muddled and kludgy, unwieldy and inflexible.  If one can use those descriptors to describe thought.  Suspect I've muddled a metaphor, there.  :unsure:

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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.