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sound = vibration. i can't help but think ecu's are sophisticated enough to figure all that out, otherwise that death metal i'm always playing would be messing with my timing. i'm no expert on this, but a quick google tells me that the ecu reads two signals - average and peak, and only declares knock when the difference between the two exceeds a certain threshold in order to ensure that it isn't reacting to background noise. they are also frequency specific; ie. designed to 'hear' knock specifically and not just any bang or rattle. so, you would have to overcome at least two checks before a lightweight flywheel or bad engine mount will read as knock.
further, the guys who would notice the effects of pulled timing the most - cup cars, etc., are all running factory GT3 RS lightweight flywheels and, while i am sure they have go-fast ecu maps, i doubt they run different/more advanced knock protocols.
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