Bangle.js 2: Control length of button press before reboot

Also the reload of the default clock face in 2 secs, where is that controlled as i might want to tingle with that as well

That one is in jswrap_bangle.c as well, in the peripheralPollHandler. It could be a neat thing to allow users to change - and I guess if we're doing that we could allow the reboot one to be changed as well (in a similar way to what's being done in JS code)...