In the stat of quickest release Romo rated as one of the best and that was measured vs all other QB. Alex Smith actually ranked 1st in his release. If you want to claim holding on to the ball too long, then I would agree that Romo at times would hold onto the ball to long instead of throwing it away, in doing that it did lead to ints because he would at times wait until the defender was on top of him, however it also lead to some big TD's because it allowed the WR that extra bit of time to get open. This is different than talking quick release of a pass.