Quote - Personally, I wouldn't be prepared to link a figure or prop's functionality to Poser's Python callbacks.  They work, mostly... until they don't.  Then: crash-ola.  A bit risky for anything really complex, IMO.

Yes, you are probably right there. Matching the location of the nipples by slaving the translations of the rings to the  relevant morphs in the figure, like I did for the native breast morphs, seems to work well enough, and is probably quite reliable, but it is a lot of work to set up. The idea that it might be possible to have a prop automatically track the location of a vertex is a very enticing one.