Wow, that studydriving site has lots of good reading material.
I just recently completed an autocross school, and my instructor was trying to teach me the benefits of shuffle steering. And while I was able to make myself do it, I really don't see the advantage of it. To me, it is awkward and every second I am trying to remember to shuffle steer, I'm not focusing on the course. I'm normally a hand-over-hand steerer, but at pivot cones, I've been known to go under-handed. Is there any time to be made up using shuffle steering or is it purely a safety thing?