The last time i checked, clutch kicking has nothing to share with shifting, you literally give a kick to the clutch while accelerating so that the engine does momentarily overrev and, once the clutch has stopped the frictioning moment, and thus is stuck back to the flywheel, the car will have a kind of "boost" effect, the wheels will start spinning and thus, on an rwd, help you getting sideways.
You can do this in sl by its own, no need to edit anything, just have to make sure you're at the right rpm before... kicking.
Harrison15 about PXRZ: he turns everything into a pretzel in his head
