The fact we have control over who enters our Personal vehicles is pretty dumb to me. It's Grand Theft Auto. If someone jacks me, fine, it's not like i'm going to lose my car forever. If i jack someone, i should be able to do whatever with their car until they get it back from me or leave the session.
Same goes with Pegasus vehicles, 10 fold actually. No, Rockstar should not let players control who enters the Buzzard, it is completely your fault if it gets taken - the thing flies for god's sack. Besides, if they make it so the Buzzard could be locked, then the Rhino would be able to locked too and that would completely ruin the fun of jacking twanker's tanks.