I've had some success trail braking but I'm not consistent. A few perfect corners followed by a few sloppy ones. The more weight you put on that outside front tire the more traction it will have but the less overall traction on the other tires so it's a question of how much is enough and how much is too much. Thats interesting about the harmonious brake and throttle ....... I've done it myself, gently, without trouble. Perhaps it cuts out on heavy applications?
I love driving schools. Lots of practice time without the pressure of a race. I've seen racers steer with the brakes, I think it will be a while before I can.

Les