For those with larger feet, actually heel and toeing can be bad, with the 86 pedals you can easily angle your foot slightly and pick up the throttle with the side of your foot, or the top right corner of the shoe. How easy you can do it depends on how close to the wheel you are (and if your legs foul on the steering wheel). Practice with he car parked is advised on those situations You also need to be careful of the brake pressure you can add by moving your foot to grab the throttle. Sometimes you can grab the brake a little more when you go to blip the throttle, and come off it by the same amount when you return to normal foot position. Its OK on the street (feels weird in the car though), but on the racetrack when you are running at the limit, it can be the difference between entering and exiting the corner smoothly, to having a locked brake, loosing time and rhythm in the process.
Its amazing how conscious you become while heel-toeing when you actually start thinking about it, despite doing it since when I started driving. Something else I've been doing, is knocking the car out of gear while decelerating, to spend less time on the clutch to pop it back in gear (its my daily, I don't want to break my box just yet )
Compression lock is a funny thing, it shakes the whole car, so rear diff, axles, mounts, bushes, suspension components, chassis, drive shaft, gearbox, clutch and engine all cop a bit of a shock when you do it, especially on a dry surface with grippy tyres. Doesn't stop me from doing it to improve the angle of the car when I turn in to work of a morning. I have an open diff, so its controllable at slower speeds. 2-ways would be a lot more interesting...