Great work - this is badly needed.

> I'd love more feedback especially about any UX issues.

Embarrassingly, it took me a moment to understand what the ^ sign meant in shortcuts.

Alt + L is "Ł" in some keyboard layouts (namely Polish (programmers)).

I suppose KeyEvent.location combined with default prevention could help here: https://developer.mozilla.org/en-US/docs/Web/API/KeyboardEve...