Another addition that would be nice to have and informative: a small badge or counter with the number of people currently editing the document? Not sure if that's easily done or more trouble than it's worth!
Almost perfect! The only thing missing (for me) is the ability to edit in one part of the document at the same time as someone else edits a different part of the document, (similar to how firepad.io works).
With that addition it would be just wonderful!
Any chance you'll be adding this source code to GitHub?