Can anyone explain how do i do this
"1) Add more fighters/bombers/gunboats per squadron say from 3 to 12 in the campaign for good and bad guys"
I don't recommend it. The game will crash due to too many graphic models on the scene.
But to answer your question. If I'm not wrong, you adjust the number of the GroupFire parameter of a fighter/gunboat/bomber weapon (devicetype) in the tacticstypes.ini file
Yes, that is it! Thank you.

I have seen max value of GroupFire was set to 5. So i tried set it to 6 and as you said the game crashes.
Is there somewhere a documentation?