The list is not that far off. But I must agree on some them. Here is my list and a short synopsis why:

Heavyweight - Ali. No Real competition. One could argue Patterson or Tyson. But Michael Dokes in his prime rivaled even Ali in terms of pure hand speed.
Lightheavy - Roy Jones. Hands down!
Super Middle - Roy Jones. Not only the fastest in this divison, but the fastest of ANY divison!
Middleweight - Roy Jones. How could there be any other. Robinson, Hearns? Not close.
Jr. Middleweight - This is a tough one. Leonard, Hearns, Norris. I'll take Hearns, who I think was a tad faster than Leonard at this weight.
Welterweight - Leonard, Hearns, Robinson, or Mosley? In terms of pure speed of hands I'll take Leonard by a nose over Robinson.
Jr. Welterweight - Medrick Taylor. Rivals Jones as the fastest of ALL Time.
Lightweight - There are so many; Mosley, Howard Davis Jr., Hector Camacho, Medrick Taylor, Floyd Mayweather. I really think Howard Davis Jr. was the fastest in terms of pure hand speed, he just could not punch worth nothing. Therefore I think Sugar Shane edges him slight because of his powerful combos generated from his speed.
Jr. Lightweight - Hector Camacho. As a super featherweight, Camacho was simply a blur. He was much faster than Mayweather at this weight.
Featherweight - The PacMan gets the nod.
The rest is hard because they are so small. THE FASTEST OF ALL TIME IS ROY JONES JR!!!! and I'm not a RRJ hugger either.