I can't imagine this hasn't been addressed yet, but I was unable to find it.
" Before a friendly ship's Attack Step, it may choose to attack from only its left and right hull zones this round. If it does, it may add 2 red dice to its attack pool while attacking a ship. "
Obviously if you choose to fire from your front or rear hull zones you don't get the extra 2 red dice.
If you choose to only attack from right and left hull zones it seems equally obvious that you can attack from only the left or only the right, forgoing your second shot, and get the bonus for the single shot that you take. If you have Gunnery Teams, and can therefore shoot at two different targets from your right or left hull zone, would both of those shots also get the 2 red dice added to their attack pool?