If I use those commands to add a new auto guided missile weapon to an helicopter, then the pilot will not have the possibility to lock on to targets (the square/diamond will not appear on the screen).
The only case where it works is where the helicopter already has an auto guided weapon.
Suggestion: also add the target locking capability of the weapon at the same time as the weapon.
This will not work because the Hellcat DOES NOT have guided weapon by default:
veh = "i_heli_light_03_f" createVehicle position player; veh addWeaponTurret ["missiles_SCALPEL", [-1]]; veh addMagazineTurret ["2rnd_lg_scalpel", [-1]]; ""
This will work because the Orca DOES have a guided weapon by default:
veh = "o_heli_light_02_f" createVehicle position player; veh addWeaponTurret ["missiles_SCALPEL", [-1]]; veh addMagazineTurret ["2rnd_lg_scalpel", [-1]]; ""