It would be interesting to hear how often people who use this method of bump starting have had to replace their clutches in the past.
::EDIT::
You bring up a good point about the gear braking. My best friend has a '02 Mini Cooper and he has nearly 70k on it so far and just recently replaced his clutch a month or so ago for the first time. He autocrosses (races) this car every weekend so if it took 70k for him to need a replacement after racing conditions then I guess the point is null.
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