JHPGT3 wrote: Regardless of the context in which they've been taught shuffle steering (e.g. it's a tool to be used in a/x and nothing more)it still likely becomes a habit from constant repetition and habits are hard to break...
The bad steering habit I see displayed by most beginners in tight turns is the "hand-over-hand" cranking of the wheel they picked up early in their stop-and-go street driving (and parking) experience, which often culminates in them having both hands crossed and together at the top or on one side of the wheel!

This habit is often thoroughly ingrained from years and years of street driving. I think teaching them shuffle-steering to replace this technique is a step in the right direction, myself, especially considering that only a minor percentage of the drivers who attend the PDS will even go on to further performance driving (I have heard only about 25% ever even attend another autox). The PDS (purportedly) is about teaching safety in street driving even more than preparing people for a future in the sport of competitive driving. In view of that, I think replacing old habits like hand-over-hand steering and the #2 offense--unwinding the wheel by relaxing your grip on it and letting it slip thru your hands to straighten the car--are appropriate goals.
If the student does progress beyond the initial PDS, and wants to learn more about performance driving, I think there will be plenty of time for them to "relearn" new habits. I'm not sure that teaching them proper big-track steering technique at the PDS is the most appropriate approach, given the scale of the course. I think that may be more appropriate for a venue like the upcoming DE/TT school.
We have digressed considerably from Kim's initial intention for this thread, though, and to "steer" this discussion back to the "Brake Early, Turn Late" mantra, I would have to say that one of the most common tendencies that I see in students is to not utilize proper threshold braking and begin their braking too early. You must be getting paired up with students in later cars who have learned to love and depend on their ABS systems, Kim! Since I tend to get paired with people in early cars, without ABS, I often find them very wary of locking up the front tires and unwilling to be very agressive in the brake zone, so for me, I'm not sure that "Brake Early" is a useful mantra in trying to enforce a late apex. I usually fall back on the "Stay OUT" slogan.
My $.02,
TT