Here's the thing, DB is annoying, granted. And sometimes really hard to avoid, and is just retard when many people are doing it at once. But this wont help at all, the most annoying dbing is when a guy goes around in his sports car or NRG with armour and just driveby's the shit out of you until you're on low hp, if he succeeds, he gets out and has a clear advantage over you with sawn-uzi + armour against you on low hp, and if he doesn't he can just drive away. There's only those few occasions when he sucks enough or you're good enough to own him even if he has armour and you're on low hp, but EVEN in those cases sometimes they just run away.
This is why I vote no to anything that involves punishing people for killing with db, because what's really annoying is having all your armour or full hp down to 50% from db. It should just flat out remove vehicle health if the driver holds on to the fire key for too long. Every second holding onto the shooting key, -100vh for the car/bike. So like in 7-8 seconds (vehicles blow up at 250vh and their max is 1000) of non stop db your vehicle will explode.