I would highly recommend joining the community discord, as all things such as this as well as tutorials are posted on there.

There is a setting in OBS for it. You need to check the box in properties that says something along the lines of "Capture in game overlays"

I don't personally think emulators should be banned. Emulators help drastically with accessibility to the run for new players. I do think however, that we need a defined ruleset that sets groundwork for what is and isn't acceptable on emulator. Speeding up the game should not be allowed, but emulators definitely should be.