First off, this isn't a poll, I'll move this, but you should've posted it in the Ideas section. Additionally, if you press the context menu key (C by default) it will change your car into public access mode allowing anyone to get in, then once they're in, press C again to go back to buddies only. Of course this only works if you're the driver, having a completely accessible car to everyone would be a bad idea, 1) it should be your car and your responsibility so if you get a ticket it's on you not whoever drove it last and 2) this would be too easily abused. So if you're driving you already can do what you are suggesting, otherwise you will have to buddy them.