@jot985,

Are you serious? how often do you shutdown or reboot. In any case, hitting the hardware button (which is always located at exactly the same position and works independently of anything else) and then tapping "Turn Off" or "Reboot" will take, even with the clumsiest hands, around 1% of the time it actually takes to reboot.

You will not again any speed with this. Only the change of accidentally shutting down or rebooting will be (much) higher.

For locking the screen you have *another* hardware switch, also always at the position and always working no-matter-what.

If you still want a widget, have a look at @mece's idea on this very same thread. Or use QBW as suggested on this very same thread.