After someone comments on a post, does the conversation reach a dead-end? This is because the original poster cannot reply to the comment.
I also think it would be good to limit comments level - I have suggested this feature too
BTW: I belive comments in the community forum are the same as for the wordpress (based on native WP comments) so maybe we can limit the numbers of comments level from WP-Admin - but will be a global setting for all comments in the WP instance
Also maybe the post author could close the conversation/thread so no more comments could be submitted below the post but I am not sure if this feature is needed for now. But it would be nice for Admin to shut down any conversation or the admin posts so users are unable to comment on specific posts.