[Yoda]

What are the problems to watch out for with dragging the right foot (I think Greg Norman did this too)?

Just don't let Knee Action and Foot Action act independently of Hip and Shoulder motion. The Feet and Knees support the action of the Hips and Shoulders, not the other way around.

As far as Greg Norman goes, his early action was to slide the Right Foot back to the line across the Heels -- as opposed to dragging the Right Foot forward toward the Target -- as he simultaneously spun rapidly on his Left Heel (his toe pointing toward the Target). He ultimately quieted down this Foot Action, and that change preceded his becoming the #1 player in the world.

But not by much.