You mean as in the back foot rather pointing west-northwest than west? (when facing North.)
It is more about the hip orientation than foot rotation. How the back foot is rotated doesn't matter all that much to me as long as there is a clean path to the ground.
Erick, Oh my gosh...
"Martiality, mathematics and mysticism are not divorced" but it seems you want martiality and mathematics to be married before they meet... I keep getting that mental image of a lot of hand waving (or cool graphics) and someone saying "WHAT ABOUT NOW?!" Step 1 of a process to mathematically decribe something should be to go experience it, THEN describe it.
P.S. If "Slappy" wants to visit my dojo, call my cell so I make sure I'm there.