tire pressure: does this exist?

i enjoy just keeping my pressures constant for a set, than adjusting if necessary by increasing. im talking of course about slicks, and track driving. since for track you want race temps or hot inflation pressure, whereas for other driving/street you want cold inflation pressure. id be hesitant about a mechanical pressure valve malfunctioning, theres probably a reason that lemans and such stick to 2 valve stems per rim, instead of 1 mechanical one…