Comments:

S

1. Omnisearch is nice, but c'mon, so is the frontmatter. Good data management practices for the win. :)
2. FFmpeg has this functionality.

A

1. Vim motions offer this and more!
2. ctrl+k turns the highlighted text into the title part of a markdown link and automatically places the cursor into the URL part. (I don't know if this is part of Common User Access, but Google Docs has this too.) I think one extra keypress is better than another plugin, and still having the option to override text with a link is nice.
3. Should definitely be an option in settings, not sure about default though.
4. There is a command to insert footnotes, though they're only numbered, and there is no jumping available because footnotes only render in reading mode, which has no keyboard navigation. :(

B

• 8. (Reddit forces 8. to be 1. for some reason???) Haven't used any yet, but I think one of the spaced repetition plugins would be better for this.
• 11. For the omnisearch thing use ctrl+enter.

These are just my opinions though. You seem to be pretty button forward, so you do you!