I guess I really dont see it because a y wing should all ready be making 2 attacks one for turret and one for ship but nope you can't do that
That a house rule me and my brother been toying with is if a ship has a primary attack and get another attack from missile's turret cannon etc it should be able to do both attack's
Actually, you can with the BTL Y-Wing title out of the Most Wanted expansion. Except that it locks the turret to the forward arc.