Looks like there's two fp scanners for the k20, one works fine with all custom roms and the other only on miui based roms. I think its a kernel problem but idk.
But i tried a lot of roms with this phone and the fp work only in a few ones. Hope the devs can patch this in the future.
I am flashlight power user Its so nice to have double click power button flashlight gesture. I find I use that more then the camera. Is this featured buried somewhere, any thoughts on how I can get this feature without some app running all the time.