I should have posted this earlier, but we now have a leaderboard for SADX Category Extensions.
You will find some cool/meme categories like All upgrades, Knuckles centurion, 20 emblems, boss rush, 125 emblems and so on. Enjoy.

https://www.speedrun.com/sadx_extensions

There should be a category where you need to build the golden Sonic statue in Casinopoils the fastest

Maybe I overlooked it but is there a category just for mission mode?

Little update,
We added the mission mode category and also Story Style Level leaderboard, for more information you guys can check this:
https://www.speedrun.com/sadx_extensions/thread/sq35f