As for the toe v. heel leads--most of the very good dancers I've seen will switch between them depending on what they're doing. I've heard toe leads make for prettier lines, heel leads make for a prettier walk, heel leads are more natural, heel leads give better stability, heel leads make for a smoother walk/weight transition. Whichever. If you can do it nicely, that settles it, IMO.
I agree with these sentiments. Children use their toes when they start to walk and I understood that this was the "natural" way to walk even if its not "normal" or habitual. Since AT requires a reasonably strong foot to carry the weight forward over the ball of the foot and the 'caresssing' of the floor. I can't see any good reason to do it any way you please, (provided its elegant)