Very Interesting thread.
I didn't read all the posts. But here is an example of several directions/forces at work. People have described this as "defying the laws of physics". But IMHO it just shows what can be done while in the air, and what not (you decide if I'm right):http://www.youtube.com/watch?v=-dzZiAnCWXo
Btw. you can do "shifty 180s" (i.e. doing 180 in the air without any direction changes/winded up rotations from the take-off) if you're really flexible/can counter-rotate very much, in a way that you do an overexecuted "twister" by counter-rotating your upper body heavily, and letting your skis rotate almost 180 (to another direction), then "releasing" the upper body back, and continuing to finish the 180. The key is just keep the skis where they stayed at the peak of the first "twister" rotation (=not easy),i.e. not letting the skis come back straight while your upper body rotation releases. I've seen this done live. My guess is that this is easier with skis on, the weight of the skis help with some "continuity of mass"(?). But I'm pretty sure you could do the similar trick e.g. on a trampoline.
And Fujas' increbidle save in the above video is based on this same trick/phenomena...although he has to do (in addition) some very heavy hand winding to get the change of rotation done. I'm not sure but also the fact he is corked (=more sideways than upright) seems to help him change the direction of the spin? Seems like he almost uses the weight of the boots&skis to help him recover?(could it be so?)