(Before asking this question, I made sure it was not proposed before. Since search did not yield a previous result I consider this to be an original request.)
Context
At the moment there is a limited set of BB codes we can use when creating a factbook or dispatch.
Problem
Having reviewed quite a number of them, I noticed everyone creates their own sort of subtitles (h1, h2, h3, etc.)
Proposal
Pages featuring long content already sport a certain style for subtitles. Take for example the FAQ: https://www.nationstates.net/page=faq
It is fairly easy and straightforward to use this existing styling through factbooks as well.