I'd be worried about wearing out the detents in the mirror folding it back that much. It's only meant to give way when bumped into to save it from breaking, it's not really meant as a constantly functioning folding mirror. That's why they called them "breakaway mirrors".
Unfortuantely though, my wife tested the "breakaway" feature of our Acura's passenger side mirror on my Snap-On toolbox. It live up to it's name-sake. It really did "break away" LOL. After about 20 minutes of looking, I finally found the glass mirror part that was missing out of the housing, which was broken completely off. The glass mirror, under the tension, had shot out of the housing, over the roof of the car, and wedged itself between the rear hatch and the spoiler!!
As far as door dings, I agree with Uneek, it's all about RESPECT. I respect everyone's vehicles around me. If I think my door might blow open or if it's too close for one of the detents in the door hinge to hold it before it contacts the car beside me, I will put my hand on the outer edge of the door and keep it there, so my fingers will be between the cars. This way, if there is any contact, it's just a knuckle touching their car, so it does not damage it. I expect the same courtesy and RESPECT back from others, but most dont care. Those are the peckerheads I will make regret the day they disrespected my property. I dont care if it's an old beat up jalopy, they will know I was there, you can rest assured of that. The dent I leave is proportionate to how crappy the car looks. Real nice car, just enough dent to get their attention and piss em off. Rust bucket, make the dent at least a half inch deep or more, and crease it. The loss of paint on the edge of my door I consider a battle scar LOL.
Oh and the idea of smooshing the dog turd in the cowl vent... yeah that would work too, but would work better if your dog had diarrhea, and you could just pour some liquid shit down there, then piss on it to really stir it up. But somehow, just the simple pleasure of knowing they stuck their nose picking hand into a tightly packed wad of dogshit under their door handle would be instant gratification. Would be a day or two before they'd trust that hand enough to hold onto a taco or sandwich......
