I too think the game is fast enough already.....BUT.....A lot of batters stand outside the box taking 5 or 10 chops which does eat up a lot of time over a whole game.
Get your sign and get in the box. No need to spend 45 seconds after each pitch tapping cleats, taking chops, laying bats in front of home plate, holding your hand up to hold off the pitch while you dig in after each pitch even if it was a ball and you didn't even swing.
If each batter wastes 45 seconds after each pitch that really eats up a lot of clock.
Heck, if they just waste 25 seconds taking chops and scratching in the box that really adds up during a whole game.
All I am saying is "Get your sign, get in the box, and try to hit the ball" and do the same after each pitch.
No need to piddle around lets play ball.