Before replying to this, I will say I'm being completely honest:
I can change speeds with a good change-up. It does have screwball type movement. The arm speed 90% of the time is the same.
I have average accuracy. That's my main goal to improve accuracy. However, I still can hit corners and throw strikes, I just can't nibble the way Maddux does (but then again who can.. Tom Glavine ).
But I was just wondering.