No, bones, skin weighting and all the other rigging stuff are working close together. If you shrink, for instance, the shin bone, you are shortening the lower leg. The whole VaM/DAZ figure is devided into regions, like pelvis/hip/abdomen1/abdomen2/chest/shoulders/neck/head...
As you may realize, many of those regions are exactly one of the bones.
If you move the bone, you move and deform the corresponding body region in a pre-defined way.
To add bones and joints, you would have to add a completely new skeleton and therefore rigging to VaM.
Without re-writing VaM 1.x completely, you can't do that.