Increase IR strength

Yes, it was never designed for long range.

At the moment the Puck.IR function can't have pins specified for it. I have an issue filed to add it, but as I said above it should be as easy as using normal Espruino IR code. Something like this should work:

function IR(a,b,data) {
  analogWrite(a,0.9,{freq:38000});
  digitalPulse(b, 1, data);
  digitalPulse(b, 1, 0);
  digitalWrite(a,0);
}

Just stick the IR LED on any 2 data bits and call the above with the 2 pins + data.