One thing to remember about doing things like double jointed knees (and V3's buttock parts)with the current Poser setup is that childern parts can only bend their parents, they can't bend anything past that. When you set up a figure (like V3) with buttock parts the thigh bending (now) can't extend into the hip, you have to stop your fall off zones short of the hip mesh, else you get creases where the bending stops abruply. I don't think the answer is more bones, myself, it is better control on the bones we have. ;-) E.K.- I did a mini-tutorial on making ghost parts in the Clothing & Characters forum at PoserPros.