Come on. Speed is a simple matter of experimentation, not a skill. Anybody that wields a cue stick and knows which end to hold can change speeds with the cueball. Plus that, how many times are you going to have to hit it at varying sppeds until the 8-ball goes in on the break? Then, for the next who-knows-how-many breaks before it goes in again you are going to have to hit it that exact same speed? Hell, the conditions may have changed by the time you've done it again.
FTR, I too have seen the 8-on-the-snap made multiple times in a row. Problem is, the persons I saw do it never did it again in all the time I saw them play. Hell, with what Sigel supposedly said, he should be the reigning 8-ball king on the planet. He's not and neither is anyone else that thinks the 8 being skillfully made on the break is the way to win. The best 8-ball players in the world got that way from running tables out, not snapping 8's.
Maniac (should have long been done with this but hey, I'm retired so what else is there to do?)
Wow. You asked the question, I simply gave you an answer. The speed is the one thing you have to vary from table to table and day to day, so it is the most skillful part of that break. You don't agree?