So it's not available any more? What a shame
I remember a few years ago (10 maybe?), an 1/8 RC driver was using a personal device with a small servo and a temp probe. The inboard system was adjusting the main needle permanently so the motor was never too rich or too lean - Ace!

Maybe it was an EFR?
An innovative company like Traxxas or Orion should really make a system like this