USB HID Support on Pico!

Hi Gordon, i did try to get this HID example up and running but it does not work for me.
I can toggle the LED if i press the button but the mouse cursor does not move.

var mouse = require("USBMouse");

function toggle() {
  on = !on;
  digitalWrite(LED1, on);
}

setWatch(function() {
  mouse.send(20, 20, mouse.BUTTONS.NONE);
  toggle();
}, BTN, {debounce:100, repeat:true, edge:"rising"});

Maybe i am missing something here? Should the pico show up as a mouse device in my system USB device tree?

ioreg -p IOUSB -w0 | sed 's/[^o]*o //; s/@.*$//' | grep -v '^Root.*'

The only relevant device i can find with this call is the STM32 Virtual ComPort.
I am using OS X 10.10.4 and Espruino 1v80