Here's another couple items about AI AA fire.
1. Ground Objects, Ships or Ground Mounted AA Guns have two very distinctive methods of engaging targets.
Weapons that are rapid fire, non-airburst (No Flak Explosion at end of Round Life, Type 0 and 1) will look at an Opposing Aircraft, Fire, Stop Firing, Try to T&E (traverse/elevate) to reacquire the target, Fire Again, Stop and continue with this cycle until the target is out of range. These weapons will not traverse/elevate and fire at the same time. Not very realistic.
If the Object in question does have a Type 4 Gunstation in its DP this all changes. It affects the way Type 0 & 1 weapons engage targets. They will now Fire and T&E at the same time without the pause between the two actions of Tracking and Firing.
Now, if the Object is a Single Ground Mount Weapon with just one Gunstation or a ship like a PT Boat that only has MG's and Cannons you may think you're stuck. You're not. You just have to add a Type 4 Gunstations to the Object. But, you don't want this Weapon to actually fire on anything. You can't have PT Boats running around with a 5" AA Gun or a .50Cal/20mm/25mm/40mm Ground Mount spouting out Airburst shells, like MS did with the Stockers. So here's what you do.
a. Open up the DP.
b. Create a new Gunstation that is a Type 4, like this:
[GUNSTATIONS]
; Existing Gunstation
gunstation.0=0,-2,1,0.5,881,7,0.01,5000,6,40,1d1*80,0.1,4,3.4,0,0,315,-180,180,90,-15,31.36
; Added Type 4 Gunstation
gunstation.1=4,-99,1,60,1,1,0.01,1,0,0,1d1*1,0,0,0,-85,0,0,0,0,0,0,0
This new Gunstation.1 is pointed 85* down, No T&E, has a range of 1 meter, 1 hit point and the round flies at 60FPS. It can't hit squat even if you do get close enough to trip the trigger.
c. Add a Guns Entry for the Gunstation. Like This:
[guns.1]
gun.0=10000,0,0,0,0,0,0,10000
d. Save and Close the DP, delete the CDP.
You now have a Ship/Ground Mount AA Platform that can Fire and T&E at the same time. This is why you see extra Gunstations in many of my ship and AA Gun DP's.
There is one other reason I have Extra Gunstations in several of my ship and Heavy Ground Mount AA Guns, Muzzle Flash/Smoke. I use a little trick on Type 4 Gunstations on Weapons like the IJA 75mm, M2 90mm, IJN Twin 127mm and the IJN Main Guns on BB's and CA's. On Objects that have just one Gunstation I add one but on the ships I just change one item, The Round Life Time. Change it to 0.01.
gunstation.0=4,-22,1,4.28,870,0.01,0.1,9400,7,0,1d1*1,0,9.4,76,0,0,0,-150,150,43,-5,2
The gun, added or existing will now act as before but you'll just see a Muzzle Flash and a small cloud of smoke when it fires.