I like the Campy set up for sprinting, hence I haven't moved from Campy. I position the levers so that I can reach the thumb thing without moving my hand. Hand is not completely on bar because I couldn't hold the camera on the other side of the bar without letting go a bit.
Before Campy I used bar ends. I cut the bars down so that the palm of my hand rested on the shifter. No moving my hand during sprints.
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"...during the Lance years, being fit became the No. 1 thing. Totally the only thing. It’s a big part of what we do, but fitness is not the only thing. There’s skills, there’s tactics … there’s all kinds of stuff..." Tim Johnson