Is it possible to have the "screensaver" run but disable the "chromecast built-in" (and possibly all the text) banner it displays?
I'm wondering how good this could be for an oled as the same text would be displayed in a constant spot if the TV is kept on. the screensaver for long periods of time.
Try a good screen saver instead of the built in one. The best one I know is Photo Gallery and Screensaver. The name is awful but the app is superb. I use Aerial screensaver option and it is absolutely gorgeous.