I never had the second or third problems. I don't use the horn on pedestrians unless strictly necessary, nor do I honk at people as revenge.

The first point was a challenge at the beginning, but I think I've done fine using both the brakes and the horn at the same time. I can think of any least one instance where both were necessary to avoid a crash. I'm certain my worst case stopping time has increased at least a small amount, but it's a worthwhile trade-off in my view.