Firmware update, first contact feedback

I was wondering what's the best way to send a data stream to the espruino, any hints about this? I first think using the USB serial functions together with a ring buffer might work. however this script:

USB.setup({baudrate:115200});
USB.onData(function(serial) {
  console.log("recieved "+serial.data);
}); 
console.log("MEEP");

is a bit unhealthy and mess up the webide. at least I don't see any motd banner anymore and uploading a new "sketch" take ages...