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I have never seen much purpose in left foot braking when driving rear wheel drive cars. After I got the 116i, I found one situation where it could be useful. When approaching a tight hairpin corner with LFB, it could reduce the turbo lag on the corner exit. You would otherwise have to go completely off the throttle, which causes very noticeable lag when you go back on it to power out. I tried LFB, but found it extremely difficult in this situation, since you have to coordinate it with downshifting.
I know some people use it for high speed corners as well, when you only need to reduce the speed by 10-20 km/h to get through. A dab of LFB at full throttle is easier to do than normal braking, as you will usually brake too much. I never do this myself, since my main concern on track days is overheating brakes.
In general, LFB is more popular in rallying than racing. Remember that Group B cars had tons of turbo lag, so you had to be on the throttle pretty much all the time.
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