Hi
Ace and other settings affect the AI only online.
With bomber gunners it becomes unclear what setting they are on when a human pilots one (drunken lunatic springs to mind).
AI bomber gunners are more accurate then AI gunners in human piloted bomber, I always get back there and get on the guns in a coop as the ai are useless spraying in all directions.
In a Dogfight server its a bit different, ai bomber gunners are more accurate and actually score kills !!!!
I know bomber pilots who never get on their guns and score 80% more kills in DF than COOP.
Offline I have no idea, auto pilot ace etc !!!
Some things got screwy over the years with all the updates.