Braking and accelerating at the same time is not unheard of. Of course, heel-toe braking is not for that purpose though. Like I said in my first post, heel-toe is for maintaining engine revs while in a turn so that you will be ready to downshift and have already matched speeds. This keeps your synchro's from having to take that split second to figure out what's going on, and it cuts down track times. I personally heel-toe in daily driving (offramps and such) because i'd rather manually match engine speeds with my tranny then wear down my synchros needlessly. Wear down your syncros and you pretty much have to replace your transmission.
But braking and accelerating is definately used by expert drivers. The technique is called left foot braking. Basically you use your left foot to control the brake, which in turn controls various things. Most obvious is that it can lock up the rear wheels. In rally racing, this is important because locking up the rear wheels will help the driver get his car into thie proper driving position while still accelerating as best as he can. Since the front wheels are still spinning, he can control the exact degree of drift and exit a corner as fast as possible.
On track racing, left foot braking is mostly used by front wheel drive cars. While on a track, it's probably not wise to go into a drift, the braking does help shift weight toward the front. With some expertise, a front wheel drive car driver can actually control his under-steer (notorious in fwd cars), which helps him control his turning line, all while still accelerating at full speed through that turn.
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