Thanks! Sorry, from your wording I'm not sure whether you are suggesting custom tags or saying there already are, but to clear up any confusion, there will be.

Thanks! Sorry, from your wording I'm not sure whether you are suggesting custom tags or saying there already are, but to clear up any confusion, there will be. That's kind of what I was hinting towards at the end of the demo - you can define custom tags and styling behavior (either globally or at a block level, or site-wide in your preferences) with keywords like "@" Trust me, I know the struggle of setting up like 500 custom math and environment macros in LaTeX. I'll try to find the best solution for this sort of thing - Polymath should work very well out of the box, but it should also allow for a fair amount of customization.