Really old post but just so people know you can select the deck gun from the top of the conning tower by clicking on a certain spot near the back of the gun while you are on top of the tower. You have to click through the wall until you find it but after some practice I can get to my deck gun very quickly now. The cursor will change when it is aimed at the deck gun but you still have to find the "sweet spot"

I will say YES !! But I cannot find a chart that was here with shot angles. Scope bearing relative to 90 AOB