this is a bad idea ...
not ctually. you don't have to drive fast, or corner fast. just "heel/toe" as you're de-accelerating to a traffic light. you can use these times to get the basics down.
i also should mention it's easier or harder depending on the positioning of your pedals.
in my mustang, it was very easy, as the brake applied lightly was only about an inch above the gas pedal....under heavy braking, it was just about even.
in my dakota, the brake pedal is 2 to 3 inches above the gas.....makes it much harder, but i've got it figured out.
now....would i tell a new driver to try this stuff in traffic? helllllll no!! but i know bigrat's a bit older, like most of us, and he seems to have common sense......