I don't know what exactly you have in mind. But here is what comes to my mind about readable comments:
You can set footnotes, become readable when mouse-over.
If you start a paragraph with one or more
>, it will be indented once or several times.
With the Folded-Plugin you can insert fold-out inline inserts and whole fold-out text passages, which can contain a whole discussion.
And combinations of these.
- Michael Sy.