I've always done primarily right foot braking in real life ( I prefer manual transmission cars).
The odd thing is I've always done left foot braking since I first bought a wheel and started playing sims.
I suppose I'm not looking to shave a few 10ths off my time to work or the shops in real life, but in LFS left foot braking makes a big difference.
Not sure what will happen when my G25 arrives, although I don't think I'll use the clutch with the open wheel cars, anyway.
If I had the option, I'd have paddle shifters in my car in real life.
For that matter, I'd wire the brake pedal to be activated by the horn.
I tend to only use them both simultaneously, anyway.