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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.
TomasJ
As far as I remember there are only 4 buttons built-in - but it'd be easy enough to add more.
Just do a text search over all the files for
BTN4, and where it says that, copy the relevant lines and rename to BTN5 :)