ArmA 2 vehicle commands

[Ext3rmin4tor]

I appreciate that in ArmA 2 a human controlled player can give vehicle orders even if the AI driver is not in the same group if it starts inside the vehicle from the beginning of the mission (i.e. if you use moveInCargo to put it inside the vehicle itself). Is there a way to forbid a human controlled player to giver order to the AI driver other than putting the player in the same group of the driver and giving him a lower rank?

EDIT: I've found a workaround. If you make the player join grpNull he won't be allowed to give orders to the AI driving the vehicle. If anyone knows a better method I'm all ears.