You can't do it for every app (at least not easily) because we don't have a standard way of redrawing the screen defined - once the screen is rotated we need to ask the app to redraw, and there's no way of doing that at the moment
Espruino is a JavaScript interpreter for low-power Microcontrollers. This site is both a support community for Espruino and a place to share what you are working on.
You can't do it for every app (at least not easily) because we don't have a standard way of redrawing the screen defined - once the screen is rotated we need to ask the app to redraw, and there's no way of doing that at the moment