Entire player-controlled ack-batteries?
Then all the lala-flying field porkers would get their panties in a knot... LETS DO IT!
Well.. semi auto I guess. They will act like normal, auto-firing ack when nobody is at the manned ack.
Ofcourse, HT has commented that the buff guns do not truly converge at one point... but at least loosely, all the defensive guns that has the right angle WILL fire towards the point you are aiming at.. and just look how devastating it is. If a skilled buff gunner is at the guns, even half a second of stationary aiming/firing upon the buff can get you killed.
I remember a really famous test, I think it was Urchin inside a buff, and some other guy flying a fighter. That guy claimed buffs aren't hard to kill. Urchin challenged the claims.. and the end result is, the guy did survive the buff attack, but failed to shoot down any of Urchin's three buffs.
So, considering the lethality of the buff guns, if the field acks are slaved to fire towards where the manned ack gunner is aiming at... *shudders*.. now THAT's what you would call integrated AA defense!

If a sucky gunner is at the manned ack, the entire field acks would be dinky.. if a skilled gunner is at the manned ack.. it's gonna be murder!