As is Billy Casper, Larry Nelson is a 'Right Foot Dragger' through Impact. It is a very natural action, the same 'foot drag' you get when you skip a rock across water with gusto.
Personally, I like Sam Snead's more stable Right Foot, but Larry's action gets the job done, and I, for one, would not suggest that he change it. The procedure does not interfere with his Pivot Stability or Balance, and it has served him well throughout his career.
What are the problems to watch out for with dragging the right foot (I think Greg Norman did this too)?