Once I've accidently selected no special access for myself in a room I was owner of, and it worked. This should definitely be fixed to prevent future accidents. Or is this a feature?
Sure, nobody forces you to take the room owner duties in a room.
And it's not like your "accident" is such a tragedy – if you really did this unintentionally (which I have a hard time believing), it's not that hard to get another owner or a moderator to re-add you.