Love the extension, something to be thoughtful of is that some of us still doc these windows on the left side and visually it looks almost backwards when I do that, IMO. love the functionality, and this is really a very minor issue, but thought I would mention it.
Also I would love to have the ability to capture proj file diffs and to be able to restore a snapshot. As you mention in the video, this does approach source control functionality, so it may not be where you want to take this. One note about storing proj file diffs, is that without the restore functionality it may hurt more people that help them, I have seen countless people mess up proj files when try to hand edit them.