I know this sort of defeats the purpose of a wiki, but it would enable us to still use it for producing "official" documents.

Many corporate project sites that have document management (eRoom to name one) also have a downloadable plugin (standalone program) for handling documents that runs on the users computer. What this plugin essentially does is:

• When the user clicks a link to a document it downloads it and opens it (Word/Excel etc)
• The document is locked for concurrent editing
• When the document is closed the plugin checks if it has been edited, if so it will display a box asking if you wish to upload the change and write a comment.

We use Confluence for a lot of things in our company, but for producing official documentation that we send to our clients it doesn't cut it. I am a big fan of not storing stuff in Word documents but on the Wiki for easy editing and reading. BUT it's too big of a hassle making it work in Word later on if it's all written on the Wiki. Therefore such a feature would enable us to have all the informal info and notes on the Wiki but still working on the offical doc as attachments.