My whish list:
Multi beam search radars with more complex search patterns like Sgt York with constant low beam scan and alternating mid and high beam scan patterns. Plus, sector search for rotating search radars where you can designate a sector for constant low+mid with the rest being high.
Increasing scan angles makes it possible to radar detect the boom and zoom CAS strategy plus provides opportunities to optimize scan pattern for quicker target detection like in jets.

Ability to select scan speed on radars with this capability like ADATS that has 2 scan rates, fast for short range and slow for long-range detection.
Burst/Single fire
The ability for gun AA to fire in bursts. This gives the ability to better conserve ammo avoid overheating.
The ability to lower the rate of fire significantly so you can fire single shots easily, would improve AAs with APDS belts ammo usage.

Auto Slew 360°
Some vehicles has the ability to turn on AUTO slew to nearest target detected by radar. This ability would decease reaction time and for the AA player, should be optional and not default so you can engage ground targets without being forced of target. It could also be cool if you could set priority to be either missiles, jets or helicopters on the most advanced vehicles.

TV(Contrast) sight
Some AA vehicles uses black and white TV/contrast sights instead of normal optics, it would also provide longer range ID than thermal for vehicles that feature both.

Sight reticle in full-screen radar control mode.
It would be nice if you actually could see the custom sights you are using, for emersion.

