Why not add master level speedruns to the list? It could also go in category extensions, but super gore nest master level ultra nightmare would be a fun category

Not sure if anyone has said this before, but a cool category would be obtaining every color wool in Solo/Duo and Trio/Quads.

Yes

For the co-op category, for larger numbers like 7-10+, does every runner involved need to record and have the video linked to the run?

Also, is Minehut the only free server where I can try to do a multiplayer speedrun?

I just got my first run that was under an hour. It was 1.16.4, and I was using Optifine. I had no idea it was banned until just now, that really sucks

They should still accept the run, the fact that there is a dropdown menu to select if you are using Optifine or not should have a purpose! If I select 1.16.4, and select I'm using Optifine and make that publicly visible, then people can know that the influenced mob spawning could be affecting it. If people don't want to see those runs, then use the filter tool.

I just got my first run that was under an hour. It was 1.16.4, and I was using Optifine. I had no idea it was banned until just now, that really sucks

I agree that they should still accept the run, the fact that there is a dropdown menu to select if you are using Optifine or not should have a purpose! If I select 1.16.4, and select I'm using Optifine and make that publicly visible, then people can know that the influenced mob spawning could be affecting it. If people don't want to see those runs, then use the filter tool. That's why it's there!