Expose an API to get public data about the ongoing race. Could be loaded on websites to show live stats. Maybe even support EventStream (SSE)?
Public data like current standings, map list, player list, chat, could be easy as it's read-only and public.
However, we could expand from this and let admins control ManiaJS -- or even the server it self through ManiaJS -- using the same API.
It could also be great for streamers to be able to for example have the player list in their browser and switch the players there. I'm no streamer so I don't know if that would work well.