Screen lock app or gesture

I'm a fan of not having to use any of the physical buttons, this is why i liked using custom roms, on my other devices, that allowed this and also taking advantage of the gesture features with the launcher i use, Nova Launcher.

So for rom version 5.1.1 i like it the way it is, but it's just lacking the option to lock the screen without having to use the physical button. i've installed the app "Reboot Menu" and it has all the features i need but the Lock Screen option lacks for me, because when you use the feature, and wake the phone up again, the Reboot menu is still open. If it closed after the selection that would be great. If Nova Launcher had this feature within the gesture options..that would be even better! anyways, anyone with me on this? is there another app better than the Reboot Menu app?