I've been wondering about a feature that some Lexus cars have that might be possible to implement on a GM truck. When driving at WOT and the trans has downshifted to get the RPMs up, if you let off the throttle it will not upshift immideately, it will stay in the lower gear for a few seconds in case you get back on the throttle again. Would it be possible to add this feature to a new GM vehicle through the PCM tune?