Quote - stewer (Stefan Werner - SM's maintainer of Firefly) told me that Firefly displacement is actually 3-dimensional. It accepts a vector, much like normal maps do. But only a simplified form (equivalent to bump mapping) was exposed in the material room.

That is interesting.  So the displacement vector isn't wholly inherited from the polygon normals?  Or what? 

I've tried Poser's normal maps and they didn't seem to be able to move the surface against the polygon normals, but only along them.  I assumed I was doing it wrong.  Hmm.

Quote - But using a proposed displacement map to move exiting points in real life would allow to morph the figure-prop by a map. (if only relative to the surface)
Allow the cloth room to drape around this morphed figure-prop.
Allow the hair room to "hair" the thus morphed mesh.

This does sound like it could be useful, to prevent poke through in dynamic simulations on areas of a mesh which are highly displaced.

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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.