I haven't seen canting done on the inside of the boot but I haven't worked in a shop in years. I don't know what the kind of boot the skier has could have much to do with alignment and canting. I see skiers on the slope all the time with canting issues. Just not done enough in my humble opinion. Usually not addressed by teachers although I see that is changing.
It does. My boots are canted outward 1 degree out of the box. Its one of the reasons I chose them. They also have cuff alignment screws on both the lateral and medial sides.
I chose my AT boots as well because of the built in stance. They weren't the boots I thought I'd be in, but were a much better choice for my particulars.
That is pretty neat. How did you determine you needed 1 degree outside?