Your comments

Never thought of such a feature before, but really this could come in handy. A special gutter with a lightweight API so that plugins could display information gathered by running a command in the background… pretty neat?
This, would be quite awesome along the keyboard shortcuts, but it may not be worth the effort.
Agreed, the palette and the doc should be enough. The doc could should be improved on this side though. Keep it up :)
Another killer feature which may not be mainstream right now, but could be pushed forward and spread like a fever :) +1