One thing that really struck me on sign-ups was the lack of clarity in regards to Doctor Who. It didn't say anywhere that only telly Who would be allowed, but it also didn't provide an option for people to expressly state that the fic they were submitting relied heavily on book/audio/comic canon. It did effect my sign up as I would've submitted a different fic if there'd been a way to state 'audio knowledge is necessary'. And from the way things were set up I still could've without breaking any of the rules if I was a terrible person. Which is something to consider, either state straight up that only telly who is allowed or use the way AO3 is set up to allow for stating audio/book/comic canon.

As for Melee I can't say much because I haven't participated. I find the googledoc to be really annoying to read, tbh.