Heel and toe is just a trick to manufacture a third foot for a 3 pedal car. You are clutching to downshift, you are braking into the corner, and you are blipping the gopedal to raise the rpms to match the lower gear so you don't lurch it when the clutch disengages. the toe is on the brake, and the heel is on the gopedal. Really helps to have the same height on the two pedals, and to have a top hung gopedal, and a foot that's not a size 13. I end up braking with the arch of my foot and blipping with my middle heel.

I have used leftfooting for years to get better turnin into a corner at speed, aka trailbraking, since you get a weight transfer to the front wheels and an increase in traction therefrom. I never really thought about doing a lot with it midcorner, but I see Charlie's point. Almost all street cars are set up to be slight understeerers, the safest route. If you go into the corner too hot, the understeer can scrub off some speed, and any braking forward weight transfer tightens up your cornering radius to keep you from straying wide. lift throttle weight transfer does the same better turn-in. You have to learn to be aware of the placement of the weight on the wheels as you brake, accel, and turn the car before you ever get good at control at the limit.

I want a Caterham. Y'all are just torturing me. Next thing you know I'll be entering the SR in an autoX or driftin' meet. I am the reincarnation of Tazio Nuvolari, in my own mind, at least...