Redmine

Realize I may have posted in the wrong forum originally as this is more of a help question then open discussion.

Excuse my post if this has been answer previously. I'm running Redmine 2.3.2 and have noticed something about the private comments

There seems to be no ability to add a watcher to share private comments with other users. Is there a plugin for this? Is a plugin the correct way to implement this functionality or would a patch be the correct way?

A scenario could be a private issue has 5 watchers. A new comment is created and only to be shared with 2 users. Those users may or may not be part of the issue.

Thanks for any help or direction on this.