Bill James once wrote in an Abstract a piece about what players you should use in a sacrifice situation, and which players you shouldn't. At one extreme was Babe Ruth (don't bunt) and the other was Mario Mendoza (bunt). My roommates and I thought the same scale could be applied to issuing intentional walks. So in a perfect baseball world, those little walk/don't walk signs you see at street corners would flash a green "Ruth" or a red "Mendoza."