sorry if i missed something, how can i put the button on the lock screen? that looks like as a nice Improvement!
i use https://play.google.com/store/apps/details?id=mobi.freeapps.flashlight.free to solve this bug. and dit remove the button from the slide down top menu so i not use the original button by mistake and get my self in to trouble again loosing licht and my phone in the dark. i was stupid enough to do that on a remote place with scorpions 
around.