For an experimentation, I would create a hidden view. So, I want to know how to change my view by pressing two buttons at the same time and for 2 seconds for example.
Having multiple screens/views is pretty straight forward in watch-apps, but what you're thinking with buttons isn't. In CIQ you can't see things like two buttons pressed at the same time, and long press on any button may already have a function used by the FW. For example, on some, long press of up is "menu", on others, (like the 645m), long press of down is the music control. On some, hotkeys and be defined for things (on a f5, long press of down defaults to the widget loop).
Maybe something like "if down key is pressed within 500ms of the up key"..... (save time when up key is pressed, and see if that's within 500ms of when the down key is pressed). You could of course just use up/down to rotate through the screens/views.
