Allow MeshDeform modifier to work better with Multires modifier and subdivision levels.

I found my self trying to do this and saw that it wasn't possible, so I would like to see the MeshDeform modifier work with subdivision levels automatically, so that I can try different poses, then step up and down subdivision levels while sculpting on the posed mesh.

If not binding to every level separately, then just binding to the base and having that affect the rest of the sub divisions.

You would use this control mesh to deform a model like it was rigged, even if composed of separate objects.