So despite having spent some time focusing on the inside ski in the last couple of years, I had never taught it. Thanks to BTS' explanation, I felt confident enough in being able to explain the mechanics when the questions would arise.
Monday our upper intermediate group wanted to learn to ski faster and more in control. Perfect! We worked on tipping the inside ski to develop our balance on edges, and to create turn shape.
I got a few incredulous looks from some of the longer-term skiers who doubted they could significantly affect turn shape with the inside ski. As predicted, the idea was a new concept to everyone.
As the lesson progressed, and as we moved from simply tipping into more of "creating an o-frame" (customized to individual learners' challenges), I got some good change out of this group. Interestingly, some of the skiers started oversteering (turning more uphill at the end of the turn than they intended) - they had never really counteracted rotational forces before. Given that I have these guys for a few weeks, it's OK if there's some new habits emerging - we'll come back to the idea of counteracting the spin in our next lesson.
After the lesson, I remembered the "spaghetti legs" drill - it would have been perfect to help develop the feeling of being on little toe edges. Ah well - next time :)