What exactly do the "spherical falloff zones" do? I was playing with them in the thighs of my Gerry Anderson UFO series alien model to get rid of distortion that arose when he spread his legs apart. The effect was: (a) the marker ellipse moved about as if it was an equator drawn on a big invisible sphere that I was rolling about; (b) his thighs went into assorted weird zigzag Salvador Dali -like distortions. In the end I switched "use spherical falloff zones" off.

Here is what I've discovered so far - Everything in the body part that falls within the Inner MatSphere is affected when moving the joint - Everything between the Inner and outer Matsphere is a blend zone - Everything outside the outer matsphere is not affected when moving the joint - You can scale the size of the falloff zones with the scale dials. I've found it handy using these on shoulders, thighs and ear joints to help minimize distortion.