"I've written a draft PEP that I've sent to the PEP editors (if you're interested, it's at https://github.com/benhoyt/scandir/blob/master/PEP.txt). If any of the PEP editors are listening here ... would love some feedback on that at some stage. :-)"

Oh you wrote a PEP? Great! I pushed it to the PEP repository. It should be online in a few hours:
http://legacy.python.org/dev/peps/pep-0471/

PEP editors are still useful if you want to get access directly the Mercurial repository to modify directly your PEP.

If you have a PEP, it's time to send it to the python-dev mailing list. Don't attach it to your mail, but copy PEP in the body of your email for easier inline comments in replies.