Spandex, I guess this could go on forever so maybe we should just say "use your own judgement on what flap setting you want as long as it is legal and safe". It would be nice if you didn't PO your FO if he didn't do something the same way you would safely. I always let them because they are going to be in my seat soon and hopefully when they get there they won't act like you do. Have a nice life.