I think of course Murphy is correct in everything he says, especially the rhythym. Dwight needs a FT ritual thing, if you look at all the best they always do the exact same thing at the line. Whether it is take two dribbles and sigh, take two dribbles to the right then one on the left, (that thing Hamilton did) or that little shoulder shrug Durant does. It could help get his mind off of the struggles he's had at the line and on the shot. Any ways I don't think it is a problem that is ever going to be fixed. Thankfully Dwight makes up for it with a lot of other things he does on the court, just like other great big man in the past have done.
Matt Harpring is one of the best commentators that the NBA has. He is very good and gives great insight, and this means a lot coming from a Rockets fan like myself.