Well, it's surely kludged in several places, but the chain simulator seems to be doing what I want it to.  The attached is a version of the chain prop script which includes animation.

There's an entire third column of GUI options now, so hopefully the whole thing isn't too confusing.  I don't want to create a mini-Blender.  :lol:

I've set the animation options to the best defaults I could work out, in testing.  A few key points:

• The script won't animate unless the "Animate" box is checked, and it won't simulate unless both "Animate" and "Simulate" are checked.
• The script opens listing the current frame as the start frame.  The script will use the current frame to build the base geometry for the chain, so it will ignore any effort to set the start frame to one which is earlier than the current frame.
• The script indexes the frames from zero, rather than one.
• The script will ignore any marker which isn't parented to UNIVERSE< in the simulation.  This allows end points, and any other marker in the marker chain, to be animated or locked.
• The chain geometry defaults have been altered for faster animated chain creation.  Sections has changed from 28 to 14, slices from 10 to 4.  This is faster and it doesn't look too bad unless you're getting very close for a render.

Most of the animation options are hopefully pretty straightforward.  The rest of the script options haven't changed from the last release.

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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.