I always hate to "butt in" on a topic unless asked, but I would guess that one of the bk's you saw snowboarding was Chris Higgins.
About 10 years ago I coached Chris when he was going to the University of Wisconsin and I was running the snowboard program at Tyrol Basin, and teaching part time at Vail.
We kept Chris' leg a secret for a year or so, training privately, until he placed second in his age group in the regional USASA race series in slalom and GS --- even the other riders did not know.
Chris later when on to work for "flex foot" and other companies in the industry. He became a competitive athlete in several sports after he moved to California, and did some inline skating commercials and that stuff.
I lost contact with Chris a few years ago, but he should not be hard to find if you want answers.
There was another snowboard instructor named Chris Sandowski that I worked with at Vail. He probably knew as much about teaching in this area as anyone in the country back then, and was the main person that Vail referred snowboard students to for lessons.
From my experience training Chris Higgins and others, some of the questions you ask, even a simple one, like "which foot forward" does not have only one answer. It depends on the person. The instructor/coach has to use his or her trained eyes in movement analysis to see what the individual snowboarder is doing, then give the appropriate feedback, encouragement and direction in small steps as you go through the journey together. It is not a "one answer fits all thing". More than anything else, the instructor should do good demos, keep moving on appropriate terrain, make it fun, and not talk too much.
Don't know if any of this helps, and someone could write an email book about what goes on in a single day's lesson. I will send you my phone number by private email if you ever want to bang some ideas around.
Stay loose and let the board run. --- "Ghost"