As you asked......
I had been driving in real life for about fifteen years, both manual and automatic as well as doing some carting before I got my DFP.
For some reason, the day I got the DFP it just felt right to left foot brake like a cart. I didn't do it to be faster and I didn't think about it so my guess is that it came from the bit of carting I did, but that's just a guess.
In real life I always right foot brake, even in an automatic. I'm unconvinced of the advantages of left foot braking as people like Rubens, among others, have proved you can be pretty fast right foot braking.
In the game I think left footer brakers may have a small advantage, but I'm not certain. I can't see any reason for me to change at the moment. I wonder if I'd change my ways if the brake had pedal had some kind of FFB in the game.......
As for gears, I've spent about 50% of my real life changing gears with my left and and 50% with my right so I haven't really got a strong preference.... perhaps I prefer the right a little as that's what I do the most at the moment.
To be honest though I don't find that current gear and clutch shifters anything like real life so I wouldn't use that in the game anyway.
Oh, concerning voting: I voted after reading the first post so I voted for the "Left-foot brake unless using clutch". Having read the rest of the thread now I realise that should have just been the "left foot" option :-)