It's interesting that you say that, the ankle is the only joint that is truly limited in ROM because of the boots and can only do so much while there's a huge mass of meat above it free to swing in all planes.
I would argue that while skiing start from the ground up as in turn initiation, rolling the ankles, steering, edging, and all that, balance comes from the hips, torso, and arms.
Jzamp...like Skidude, I am rather weary of this thread. But consider the title of this thread then re-read this post you wrote. I don't disagree with any thing you wrote, but sagitally speaking, as a rule we make most fore/aft movements by moving the Bos underneath the Cm. I didn't invent this, but I was coached it.