They had a self starting sprint car class around Missouri and Kansas for a few years. They didn't last and now they push start them around here the traditional way.

A well run track with on the ball push trucks and safety crew really doesn't take much longer than watching the self starting cars try and try to get it to fire after a spin till someone realized maybe they should send a push truck.

Not to mention how they can never get them to start until the yellow flies then suddenly they fire right up and rush to the work area.
Want to speed the show? Add some laps to the feature on the self starting classes but count yellow flag laps. (but you would have to be willing to send aggressive drivers to the back, put them a lap down, or start using the black flag)