I'm new to speedrunning and I was tempted to try out Any% No QS/QL on PS2 EMU. But I noticed that not only could I not select PS2EMU but even going into Submit Runs, there was no option to select PS2 EMU. Same for Any% No Alarms. Is there a rule I am missing where only some categories are allowed PS2/EMUs and others aren't? Sorry for the dumb question in advance.

Hello! That is absolutely not a dumb question. The forum is there to ask questions like this, so don't worry about it!

You can run PS2 EMU for No QS/QL and there is no problem with that. We have recently restructured the leaderboards to support each platform and emulator separately. However, if we put all combinations in right away, we will end up with a ton of empty leaderboards. Basically, once you have a run ready to submit, let us know and we will add the platform to No QS/QL! :) Feel free to just DM me, or any other mod you are comfortable with, once you have a run ready.

I hope I could answer your question. Good luck with the speedruns!