Personally, I don't think it really has a distracting effect on the hitter. The differences in the numbers are probably largely a combination of two things (though there's no way to test either of them with any accuracy). 1.) Managers tell their hitters in the two hole, or their crappy hitters to be more patient when a stolen base threat is on. 2.) Pure hit and runs and safe hit and runs put hitters at a disadvantage. Obviously there probably is an effect subconsciously to hitter, but there are things working consistently against his favor that he has no control over. Then again we'd expect him to more fastballs, have more opposite field holes to hit in and that in general more ABs come against crappy pitchers with stolen base threats on (because crappy pitchers let batters on first more frequently!) So things are pulling both ways. I think its a washfor all practical purposes myself.