Ok here's my concern with an accurate sight that functions like what you've described.
This is the effective maximum range for a torpedo drop from a PT boat. I have sunk CV's in the main arenas from over 4000 yards so I know it's accurate.
With a 45 degree bow on shot, a US torpedo could be dropped from 3.8 miles (6700 yards) away from the target (and don't forget torpedo planes live below radar) with little to no warning on the CV. A good pilot would fly below radar then simply jump into the gunners position to do a rudder turn with out giving the CV any chance of spotting him.
I'd like to see the torpedo runs be a bigger part of the game just like all of you. But I would hate for a seemingly good idea, create a bigger game play problem, with CV's getting sunk left and right.