Yes.. I doo...
It's called Heel/Toe.
Basically what it is... is when your flying down the track at 100 MPH + and you have a turn coming up, what you do is with your LEFT foot you push in the clutch and put the car in Neutral. Now... as you are approaching the corner you need to slow down, using the BRAKE. Now in order to slow you down REALLY HARD or fast... and help save your brakes... you can DOWNSHIFT at the same time.
*DOWNSHIFT = Engine Braking and Manual RPM selection*
Now think about that.. braking and downshifting at the same time? We only have 2 feet?
This is where the Heel/Toe technique comes in... while turning you can brake using your right foot and your toes and your left foot on the clutch. Then you use your right heel or the side of your right foot to Blip the gas so your car doesn't stall.
So that's why whenever you see Race Drivers use 2 pedals with 1 foot it's because they are trying to brake and downshift at the same time for appropriate slowing down and perfect RPM selection on the APEX of the turn.
You don't want to be at 3,000 RPM when exiting the turn and trying to smoke everyone on the straightaway when your peak HP is at 7,000 RPM! So downshifting also allows you to be in the right gear at the right RPM's at the right time!
Make sense??
Capeesh?