Really impressive work. I hope to be able to use this with my transformation scenes; it'd be great to animate actual genitals shrinking/transforming.
Seconding the request for positioning control - I tried to use it with a random model and found that it didn't really sit in a reasonable position. Maybe instead of modifying the mesh directly, you could use morphs to move around the position of the base? That may not be feasible with how VAM works, though, I don't know anything on the topic. It did seem like I was able to adjust things slightly with the built in morphs, just not enough for what I needed.