Lack of maths is the main reason we are not considering Tana in my group (physics research) so addition of this would be awesome. The syntax $..$ for inline and $$..$$ for display would be the best as it taps into muscle memory for anyone writing latex, see Logseq for a good implementation in an outliner and Obsidian for long-form writing.
Conditional formatting based on super tag would be really useful for making certain nodes stand out. Like quotes, warnings, etc