It's been mentioned before in response to the suggestion to remove reaction times from the time slip. There are racers that are pretty consistent with RT's. With a box and no RT's to go by, all they do is take out time till they red light. Then put a little back in!
It's possible to do that without a box too, by changing rpm's, tire pressure, etc. But at least it's done with physical/manual changes, not electronic, pneumatic, etc.
Keep RT's, but reduce electronic driver aids.
Locomotion Racing
http://www.geocities.com/locomotionracing