Group the buttons in the left ribbon into labeled, color-coded sections, and reorder them by dragging.
A real terminal below the editor: several shells in tabs, each with a real TTY, plus one-click cd to your vault or to the folder of the note you are editing.
Taiwanese almanac calendar: public holidays, day-off adjustments, lunar dates and solar terms in a month or year view, with a sidebar view, a floating window and periodic notes.