I have added an OAuth plugin to the repos.  There is now a granular
perms system for it (the only defaultly supported endpoint is
comments).  The OAuth plugin also adds some functionality to the
comment-posting API (namely, so that a URL can be submitted in place
of a numeric post ID)
When paired with my XRDS plugin this demo works
<http://singpolyma.net/oauth/example/wp_auto_client4.php>
--
- Stephen Paul Weber