Quote - is there an upper limit to the number of links it can create?

I haven't set one, so theoretically, no.  The script takes longer to create the chain, as the length increases.  Ten links is very fast, 100 takes a bit.  A really long chain would be impractical in Poser, I would think, but one could try to make such a chain.
I suppose I should do some tests, and watch the timing and the RAM consumption.  Hmm.

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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.