The first two are in the roadmap for the built-in library. To do those requires more metadata. There has to be a way to correlate knowledge of what accessories go with what objects, and which objects (and the metadata that goes with them) are currently in the scene. Presently, once an item is in the scene, where that came from is not information that is kept as part of the scene. More specifically, "what is this thing that is selected?" is not a question Poser can answer at the moment.

The auto hair fit thing is one of dozens of plugin capabilities that are under consideration. How to do it in an extensible way by 3rd parties is the big question. In a nutshell, how can a vendor add behaviors to library objects (probably written in Python) that can be invoked when an item is loaded or manipulated? A hair fit for is a perfect example. Certainly the figure doesn't know about the hair fits possible, so the hair itself must supply this behavior somehow. And it needs information about what it is being loaded onto in order to do it. (Am I loading on V4 or V3?)

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Renderosity forum reply notifications are wonky. If I read a follow-up in a thread, but I don't myself reply, then notifications no longer happen AT ALL on that thread. So if I seem to be ignoring a question, that's why. (Updated September 23, 2019)