Threshold braking is a necessary racing skill. In LFS, people just set the max braking force so that they can slam the brake pedal down without locking up the wheel. This isn't very realistic. If I use a realistic setting, I'm at a disadvantage. I think this option should be removed from the setup screen.
I'm not quite sure what to do about mouse and keyboard users though... they won't be able to complete a lap if they lock up the wheels around every turn.