The current IK system does this - albeit Hard IK. The goal and chain from it are specified in the figure{section of the CR2. I think your 7-points are a good indication of what needs to be done. A jaw bone would be desirable. It alone would remove a large number of morphs that used to achieve the same thing. If done properly, the results would be more anatomically realistic. I think the problem with the knee isn't that it is a space-hinge joint. It is a sliding joint (the patella). If you study how your knee bends, the patella slides up and down with attached ligament (patellar ligament). If you have "Human Anatomy for Artists", you can see this on page 35.

C makes it easy to shoot yourself in the foot. C++ makes it harder, but when you do, you blow your whole leg off.

 -- Bjarne Stroustrup

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