what you are asking for already exists.
how to use 8" guns:
get in a gun position.
open clipboard, zoom in, click on target.
press shift-Q to enable Land Mode.
zoom.
if you cant see the target, hit F8 and slew the sight view so you can.
fire.
observe impact and readjust fire.
I was tempted to say RTFM but the "manual" is out of date and wont help you. in fact the help system for AH is a complete dogs dinner, most of the really useful stuff is hidden away on the trainers pages.