Just throwing this out there, you can already animate some of the weight map channels. The issue, is an easy way to edit them.

As far as a weight mapping system to eliminate jcms, you need to be able to move vertices on the 3rd dimension to the joint. Which again can be partially done already, but has many issues and consumes channels normally used for something else.

Oddly, I don't know of a single joint system that doesn't need jcm's. Even implicit rigging uses them....

---

Some things are easy to explain, other things are not........ <- Store ->   <-Freebies->