I would like to see the option to duplicate items within a message manager feed. This would make it easier for people with "User" privileges to keep design consistency while still having the power to edit the text within the item.
I recently had a client who wanted to use their feed to list announcements. Every announcement could vary in length which meant that they needed more control than a Custom RSS Editor. Trying to train the user to use the message manager editor was very difficult. Even after they figured out how to add a background image and text boxes the idea of having them keep design consistency with text size and layout was another chore. If they could duplicate the item in the feed then they could simply click and edit the text of the new item without needing to think about placement and styling.