It's still not clear how to effectively use a horn while riding, since for me at least, I can't get to it until after an alarming situation has passed. Clutiching/breaking/accelerating/swerving all come first, and by the time danger has been avoided it's too late to honk. While on the freeway I'll sometimes ride with thumb on horn in case someone starts moving into my lane, but that's about the only situation where I'm horn-ready. Ideally it would be great if some throttle manipulation could honk the horn. Maybe an extra hard squeeze. Or perhaps something related to squeezing on the tank with your knees. Just something that allows it to be deployed when it still can make a difference.