Nice stats, even though I don't think they are that meaningful.
Also on your list, wasn't 2005 wimbly last point an almost ace by federer? IIRC roddick barely touched it, I wouldn't call that an error. I wouldn't call that a clean winner either, but it's more a winner than an error to me.
Well, Roddick had no chance of returning it but he managed to basically stop the ball so under the definition of winners, this wasn't one.
It would perhaps be an idea to differentiate bewteen forced errors and unforced errors? Not that it matters much.