This has been already suggested.
Such a suggestion hasn't been posted yet. The topic, you're referring to, is absurdly excluding a decisive part of people. I agree with YoMama that even if this addition is going to be implemented for levels 2+ only, it should be discussed with everyone. Not just with the "elite".
Since we all have already agreed that no one is going to buy a VIP (donate a server) just to be able to set his own licence plate, there's no more logical explanation for disabling this feature for level 1 players.
Considering that it will be implemented, every registered player should be able to set their own licence plate. Let's allow VIPs to have it set as a part of this auto /vipme command, which would change their plate every time they enter a car, while a non-VIP would have to type a command for it manually.