double clutching is when you have to shift from 1st to neutral to second to neutral to third and so on in old old cars with unsyncronized clutches. i've also heard truckers have to do it sometimes uphill but they may not be true. Also a good method to use if your clutch is completely gone to make it to the garage. i think the powershifting confusion came from f&f, but that conversation has been had way too many times.
ya, clutch-kicking would be an interesting thing to try though. i guess if your car was so underpowered or heavy that the energy gain of letting it free-rev for that second and going the next second was greater than letting the car rev in gear for two seconds this would make sense. possible i suppose.
"Every time something good happens to me you say it's some kind of madness. Or I'm drunk. Or I ate too much candy."