I have been Left foot braking for years now and have had no problems what so ever......even had to do an emergency stop with no wheel locking as you modulate the brake pedal.
Left foot braking helps a lot in keeping a great balance with the car, a better reaction time with braking cause you are cover braking with your foot and I feel that I have better control over the braking pressure on the wheels.
If you know how to take your foot off the brake when its about to lock up you should have no problems with left foot braking.....just dont do what some tools do and have your foot pressing down on the brake while accelerating.