i don't think mdc really could regulate shuffling without making wading illegal. all a shuffler is doing is moving their feet across the bottom; we all do the same when we wade. the only real way to alleviate the problem is to ridicule the offenders. if you see a person doing it, either say something to their face, or if you don't like confrontation, make snide comments loudly and within earshot, just be ready to be punked if you try the second.
ask what they're doing, then say something like, "dude, be sporting." or "if you want, i can teach you to fish right... it ain't that hard"
also remember, the more people approach a person, the more compliant they become. even try to explain environmental effects, some people just don't know any better.
if a person just laughs at you and doesn't care, get your buddies and crowd around them. if nothing else, its fun to beat people at the "its legal... do something about it" game, and you might just let em know the practice won't be tolerated.
as for the boats, a no wake law in certain parts of the lake could quickly put an end to that problem.