Having to agree with @wartab.

It's nice to have ideas for new categories but atleast show some engagement and show a run of your suggested categories first. It's useless to add a category if people don't even try doing it to see if they even would enjoy the categorie themself.

Having an example shows people if the category looks interesting for themself to try too. There are plenty of games which have extra categories but without a single runner. It would just clutter the whole leaderboards with empty categories until someone finds the interest to even run that category.

For the expansion pass: We don't even know what exactly will be added, that can be used for an additional speedrun category yet.