Can you add tactile switches to the puck's pins and use them to send keypresses over bluetooth?
Yes, you can. You can either wire them on, or some of the smaller switches can be placed directly onto the Puck's pins.
There's some info here for the Espruino Pico, but it applies equally to puck.js as well: http://www.espruino.com/Pico+Buttons
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