Might be nice if entering Fullscreen mode by pressing F11 would do like Chrome, Youtube video, etc - where it would be accompanied by some kind of tooltip to alert people that they can press F11 again to escape from this mode. Or maybe a config option to disable F11.

I get the impression that most users rarely go into F11 mode intentionally, and it's more likely to happen when they have a fat finger trying to press F10. My first reaction to finding myself in this mode was to press <esc> like when exiting a Youtube video that's in fullscreen mode, but just accomplished minimizing several windows.