As the game has many vehicles that are using turrets, in most of them should be realistic to have ability to lock on particular target. The function would be similar to assigning target to AI gunner while player is on commander.
This should work for three purposes:
1] the obvious one, that gunners turret in assault chopper (AH-99), should be able to lock technical target, like a car etc.
2] UAV - this option should be also implemented for laser designator turrets at UAV aircraft, and in this case the turret should be lockable on particular position, not only unit. As when you are using Greyhawk and use laser designator, you are more painting on the ground that designating any target. Also the UAV should keep the particular position of the laser target even when flying without players direct control. This option should be also switchable (on/off) the same way as auto-hover for example.