Check for new comments on post comments

I have auto-update comments turned off because I have limited server resources.

However, it would be nice if every time someone posted a comment, it checked for new comments and added them as well.  

The current behaviour is a bit confusing, because if you are on the page for a while, then post a comment, your new comment will show as the latest one.  However refreshing the page would then show that other new comments have been posted and reorder yours in the list.  It would be better if when you post your comment, it also loads all current comments.