There should be some sort of training program implemented into the game. New players are allowed on foot and in passenger seats of vehicles only, until they complete a few missions on an offline training scenario. These would cover basic flying of jet's/helo's, driving of tanks/apc's, and train you about all thier functions and capabilities, and you have to complete a few training courses utilizing these things. if it is competed, then it is recorded in your account and you can then enter the cockpit of a jet or helo, or the driver's seat of a tank/apc. I suppose light/heavy transports would have no requirments to use them, but the more powerfull and skill required vehicles should have something like this. just an idea i had about 30 seconds ago, so of coarse it's not perfect, but a good idea i think.