Hi Jeff,

After receiving this feedback from our users and the WP community including Andrew Nacin we've put out a release 5.0.3 which fixes this issue. We've completely yanked the feature. I've also published a blog entry here explaining what we're going to do to prevent this from happening in future:

http://www.wordfence.com/blog/2014/04/removing-the-ability-to-disable-xml-rpc-in-emergency-release-5-0-3/

Regards,

Mark Maunder - Wordfence founder.