I installed one on mine after a couple of the guys I road race with told me that they were doing exactly as you stated above. At race’s end, they’d stay on the throttle during the ‘cool down’ lap, and as they approached the pit lane entrance, they’d kill the power and coast to the scales. Then they could get a good read on the plug. I’ve hardly ever used mine, but it’s there, and I haven’t had any issues with it. I now have a starter button located next to it, as I have installed a Hegar 4 starter on my Stock Honda.