It would be nice to be able to set a kind of timer for turning off the display during the night! People like me who go crazy about any light while trying to fall asleep would be very happy about it. I'm using an app called dark mode to get a black screen but its not so smart that I have to switch to clock mode every morning.
They just need to allow other apps to act as screensaver. You can already use a time-based screensaver, but it works only with the Clock app.