NEVER. Except in those rare instances, like you, when I have something else to do. I have been having a hell of a time stopping my son from cleating the jib too. I think you loose that 1/2 second that is sometimes vital to going over. He doesn't see it that way. I was showing my wife some of those videos and she commented, "Why are they always flippin' the sheet?"
Good thread question Scooby.