I kick my leg back while in the air as well. But I do this to get more weight over the front end, so I can bring the front end down. I don't tap the rear brake to bring the front down, unless it is a emergency. But they might do it for a different reason (like you said), just talk to some of them. If my rear end kicks sideways, I turn into the direction of the kick (if it's not a real bad kick, this usually stops it) and then drop the front end to to start steering early before the rear touches down.