There should be a way to flag individual headings for
not being displayed in the TOC. The reason is that even
though a subheading might improve readability of a part
of the text, it may do nothing good for the overview of
the entire document.
Consider, for example,
(7th of August revision). Here, the three "Quotes"
subheadings and the subheadings under each date of the
"Speakers" section clutter the TOC and don't add much
I believe the best markup for this would be a keyword
at the end of the line of the heading, e.g.:
===Official sites === HIDE_FROM_TOC
===Fan sites=== HIDE_FROM_TOC