As an automated moderation tool, we propose to build a new 'Auto-archive' feature to remove from the 'Unreviewed' filter comments that are not found helpful after a certain period of time.
http://www.mediawiki.org/wiki/Article_feedback/Version_5/Feature_Requirements#Auto-archive_comments
Note that the custom archiving feature has not yet been fully described, so we may want to start with a simple version of this tool for now, then see if the custom archiving feature is necessary.
Version: unspecified
Severity: enhancement