ARMA II Mando Missile - Timed lock on
Now you can setup locking on timed. Once you press lock on key or button you need to keep the desired target more or less centered on hud for 3 seconds and then the lock on is confirmed. While the lock on is confirming the target its green square will blink quickly. This might be an interesting option for PvP matches where you want to avoid too easy or quick locks on targets.