Ok, make all ACK on bases automatic...turn Air Strips into small Task Groups (with equivalent AA capabilities). Make the guns capable of taking out potential Vehicles camping runways. As of now, gun installations can NOT hit vehicles that roll right up to bases. I can de-ack a town or small airbase with an M3. Dont believe it? Sit on a field AFTER CAPTURE and see how many guns you can kill...its most if not all(before you get killed in Wirb). The closer you get to a GUN, the safer you are. The positions are elevated and cant traverse low enough to kill even a Jeep, just drive right up and 3 .50s its dead. A change in AUTO ack, IMO would fix the GUN FIRST defense that players may feel required to provide themselves 
I agree with you here for the most part.
Manned acks on ships only.
People who lose a 15-30 min sortie to a manned ack pisses people off more than anything.
Manned acks take no risk. Zero. Nada.
They don't protect from vulchers.
You can't "fight" against a manned ack.
If you Jabo a manned ack, they will more than likely connect, thus ending your sortie.
They aren't fun to fight against.
It's lazy gameplay.
Who would quit because they couldn't up in a manned ack compared to who would quit after getting their sorties ruined time after time by manned ack every time they jabo a field?
Players should not have the advantage of being able to ruin sorties from a field ack unless it's from a a shipor CV.