Some of the Antonia morph sets have areola size morphs, but of course as with any morph they are deltas relative to the zero-ed mesh and results may be off when posed or morphed. Magnets are another option but the magnet base and fied do not move with the vertices. There are so many factors now that influence the world xyz of vertices that is is difficult to achieve consistent results.

I am thinkng about ways to use direct references in geometry, like vertices by their sequece number. This is of course not direcly supported by Poser. One would need to keep a sort of registry and have a Python method that iterates over the refereces and make the updates, in this case that would be moving the magnet base and field to the average postion of a set of vertices. In theory tis could be a callback function, but that would be like calling for slowness and trouble. Better be it called by the user if he wants to synchronize things prior to render.