Sorry, i didn't test yet because i'm at work and my headphone is at home. I'm a bit confused because looks like you've changed only the remote.py file, at least at the time i've saw the sourceforge early in the morning and i actually don't use that file at all. I just call the oscp-n900-PA bin from terminal and it just works. Sorry. I'm a noob and have no clue weather is possible to make the headphone's keys work without that remote.py or not.
Thanks again.