I forgot just one thing...
I think we all can agree that tournament room is one-purpose-room-only. So, if you are there, you have to play, or you have to leave. I do understand that dnd/brb could be necessary in some situations (hey, I need to make some coffe as well :) ), but if you can limit them on 5 minutes - that would be more then enough. After spending those 5 minutes on any (or both), using dnd and brb should be blocked. Why? Because, still, refusing to play (by own blockade) someone who maybe needs just one more victory to win the tournament - is unfair behavior.
I'm not sure is that possible to do, but please consider it.
Thx.