Please add support for additional HTTP 40x error conditions, particularly 403 Forbidden, 401 Unauthorized, and 410 Gone, to Cornerstone’s template assignment and conditional logic system.
Currently, templates can be assigned to 404 pages, but custom layouts for other WordPress-generated 40x responses would be nice too. This would be especially useful for membership sites, restricted content, and pages that have been permanently removed.
Ideally, these conditions would be available as selectable rules alongside 404. The feature could be limited to errors generated within WordPress, since some server or CDN-level errors occur before Cornerstone loads.