A question was raised in a discussion with a friend. He mentioned how we might be able to modify a coupler on a car so that one could just barely touch something that protubes from the car in such a fashion that won't bump or move the car that will uncouple. So as to not have to have a pick and try to manage it between cars.  I've seen cut bars, etc. but how could you use them to work. Has anyone done such a thing. Specifically the standard Kadee style coupler. Metal would be preferred, but plastic might work. I'm not really sure how to picture this.