Making a copy of that and tweaking it such that it detected certain patterns of button presses would be pretty easy, and then it becomes an app that anyone can install to add the feature to their watch
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.
Just a note on the buttons... There's an app called
Swiper clock launch
that overrides the default handler for clocks so that you can get to the launcher by swiping rather than just pressing the button: https://github.com/espruino/BangleApps/tree/master/apps/swiperclocklaunchMaking a copy of that and tweaking it such that it detected certain patterns of button presses would be pretty easy, and then it becomes an app that anyone can install to add the feature to their watch