15 should cover save/save as/open/new and #43 captures the bugs with undo/redo.
Auto-commenting actually came free from Codemirror, so it's in there! It's Ctrl+/ and works both with the current line and selected block in basically the way you'd expect.
I'm bad at using keyboard shortcuts when I write code, so I don't have a good sense of what's useful to folks. What are your favorite keybindings?
Some categories: