Bingowings said:

This might sound like a petty suggestion but Vader's movements in ROTJ especially during the final duel are rather blandly composed ( I imagine partly to mask that Bob Anderson wasn't as tall as David Prowse...once again please correct me if I wrong here).

If it were possible to get someone of the right build and in the right suit to do more dramatic movements (not just during the fight scenes but generally speaking too) it may lift the character who looked rather dull in this outing most of the time compared to ESB.

This bit of art (from the Story Of ESB story album) points somewhere in the direction I hinting at :

Not all of the time obviously but for some key moments a shot like this would add a bit of the old Vader charm to ROTJ.

But Anderson was also the guy in Vader suit in ESB. Anderson is 6'1", Hamill is like 5'7", and I am sure Anderson was wear 2 or 3 inch lifts anyways.