"I'd be happy if folks would just bother to use their blinkers, instead of fiddling around with other hi-tech in their cars."
I'd be happy if people would go forward when the light changes so I can get through the intersection before the light turns red again. instead of texting, or updating Facebook, or whatever the fuck they're doing with their stupid phones.
You have a device fitted to your vehicle for use in these cases. Its usually connected to the steering wheel (although old SAABs liked to put it in strange places) and when engaged it will make a loud sound.
I give people about 3 seconds before I do this, for those with a difficulty in perceiving time, this is long enough to say "wake up Jeff, we need you for the show".
BTW, as the owner of a loud car, when I see someone on their phone at the lights in my rear view mirror, I generally give it a bit of throttle to wake them up. Its fun to watch them drop their phone and panic. The death stares they give me after they realise I'm doing it deliberately are priceless.