Just to show that JCM are not a DAZ conspiracy against human kind, a 3 years old video of JCM creation in zBrush and Modo.

So, I guess you're denying that is was Rob and Nerd3D who came up with JCMs?  Wow, nothing quite like denying your own history! "It all became public knowledge when Charles made a post looking for a way to “…make a morph channel affect more than one body part.” In answering his post, I first stated that it wasn't possible. I didn't want to elude to my findings yet, which were later labeled Partial Body Morphs (PBM), because I needed to pin down the specifics of how it worked before I tried to explain it to someone else; I was stalling. He replied with findings of his own on what later came to be known as Joint Controlled Morphs (JCM), forcing me to speak up. JCM had been something I'd been attempting in the months prior but failed to place the data in the correct location… I'd been trying to put the code in a controlling channel and point it at the slave, when it should've been the opposite (at least, to operate the way I intended it to)."

http://docs.daz3d.com/doku.php/artzone/wiki/user/rbtwhiz/technotes/content/erc/start