EDIT:
Sorry this I made this while in a bad mood so it comes out at a bad rant rather than a reasonable suggestion.
#1 Manual MIGHT be better with 6inch+ guns. I dont have any level 100+ gunners so Manual and Auto FCS have the same accuracy/spread to me. NOT THE TOPIC ISSUE.
#2 auto FCS is MUCH, MUCH BETTER with close range guns like the mortars. Manual screws up the turning speed, gun synchronisation, rate of fire, and accuracy. You cant "hip-shoot" with it.
#3 manual allows people to use AA weapons. thats nice, but the accuracy, rate of fire, and my guns freezing after almost every volley HURTS ALOT.
#4 manual is very bad with mortars, but I dont think they would offer much to torpedoes.
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AA GUNS NEED RAPID FIRE, QUICK TURNING, AND SYNCHRONIZED GUNS, none of which the manual FCS allow. So Automatic FCS WOULD be a better match if the admins actually allowed AA fire with Auto FCS.
Thats the suggestion, allow Height changing for guns while using automatic FCS.