I would be more interested to see (and I think easier to implement) at per control point depth control. This would give you V-Carve effect but you could control the depth at each point.
Point A: 0 depth (surface)
Point B: .05 depth
Point C: 0 depth again
Point D: .125 depth
Just my thoughts. Since EASEL obviously can already send depth commands, is it much farther to go to this?