Ya not alot of people use all three pedals at the same time . However, once you get good, you won't even need the clutch to go through all the gears, up or down.

 

Just practice w/your stock pedals.. That way if you drive another car, you won't be handicapped by being used to wider pedals.

I actually don't use my heel.. I just put half of my foot on the brake, then roll the side of my foot onto the gas. Everyone has their own style I suppose, but that's what works best for me.

It's also a bit harder to get the revs matched properly, unless you are in a track/racing environment.. It was a little difficult on the street for me you really can't compress the brakes enough to roll onto the gas.

I just started by practicing w/my car off to get the foot placement right, I tried it on the street and almost rear ended someone ... praise jeebus for ITR brakes :naughty:

 

It helps the wear on your breaks big time, once you learn how to do it properly, you'll notice your breaks last a lot longer.