First of all, LFB in real Life is not dangerous at all. As was said before, if you've gotten used to it, it's just as safe as RFB. Taxi drivers do it all the time to stress both sides of the body a little more evenly (erm, bad example as far as safety goes - Taxi drivers
are dangerous
). I used to LFB all the time in my good old automatic Nissan Sunny, but I don't do it anymore as my good old Audi 80 has manual gear box (measly four gears, actually). In LFS I LFB as I feel it is much easier and faster, as said before.
About heel-toeing in LFS: I don't know if it's just me, but I don't think it would be very effective, as there's virtually no way I could get my right foot on the gas-pedal properly and controlled while fully pushing the breaks. Might be that I'm not loose-jointed enough (very likely) or I need to set up the pedals on my FFGP differently, so that I would have full break power when the pedal is only half compressed, or something - don't know, but I guess I'll keep LFB. Unless I should get a clutch pedal or the G25 one day (not very likely)
.