In every project when we work in sessions our routine is that you are allowed to use replies on comments but not to change the status on replies.
Since you can't sort comments based on the status of the reply it becomes a problem and easy to miss. There for I would like to be able to disable everyone from changing status on replies, or maybe automaticly if you change status on a reply, the original comment also gets that status. I imagine that it could be messy if there's a lot different replies, but I've never had that problem so in all projects I have worked with it would work as well.