I have found some clients get confused when the naming conventions for CF's roles confilct with WordPress' core roles. For example, the WP user role with highest permissions on most of our sites (client-side) is 'Editor'. However, users invited to be 'Post Editor' by CF are commonly those with lowest WP permissions (eg. Contributor). I therefore propose a name change for what we currently call 'Post Editor'. 'Post Contributor' sounds more accurate but then this also conflicts with a WP User role and I'm sure there are cases when users with all sorts of user roles are invited to edit a post. Up for discussion.