I wouldn't do it in my 2005 vehicle, but I don't have anything that requires the engine to be running in my '94 Honda VX... No power steering, no ABS, no ability to read minds (ESP), etc. Brake boost is vacuum, and it holds for about 10 brake applications (I tested in a safe environment).
I understand you think it to be unsafe, and therefore I suggest you don't use this tip. I am comfortable using it and will continue to use it under the appropriate conditions despite your objection to the tip.
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