Provide a tool for moderators to migrate comments to chat
Over on Christianity.SE we're drowning in comments. Posts are constantly spawning discussions and we delete a lot of off-topic comments when they start wandering from improving the posts to side topics. The deletion practices have been the subject of lots of complaints and we had to launch and education campaign to explain what comments are for.
That helped, but it's still not quite satisfactory. It is still common for comment threads to start out as mini-meta discussions on the quality of a post, but at some point they start chasing theological goose trails.
The links presented to active commentors to migrate to chat are great and a few people have used this well, however the majority of people ignore the warnings and keep right on commenting. Rather than cause continuous consternation over deletions of ongoing conversations, I propose moderators be presented a tool to create these chat rooms and auto-migrate the existing comments to a new room. Users ignore the hints to do this and just deleting things is not well received, but being able to force the issue and migrate to chat would allow us to clean up the comments on the site AND allow the users to go on talking.
I realize we already have one of the most prolific chat room creation rates per-capita on the network. I don't want to flood the chat system but the alternative is not not having chat rooms, it's constantly having to talk users through actually hitting the link themselves.