push button ignition
Ya know there's something I forgot to mention, and that is SAFETY.
Ever have a throttle stick? Return spring come off? One time I had one of those old "pizza pie" air cleaners, and the very short stud came loose, vibrated out of the nut, AND the carb, and fell down into the throttle bores
Sometimes it's just pretty damn handy to be able to reach up there an turn that key and know that a split second later, that engine is going to STOP