Question
What grounds allow procedural appeal? Is en banc review possible? Does it require a supermajority?
Why it's a real question
Arbiters are the resolution backstop for content and conduct disputes. A genuinely-final tier with no procedural review would concentrate substantial unchecked authority in a small body; an unbounded appeal pathway would defeat the purpose of having a backstop at all. The right shape is somewhere in between — narrow grounds (procedural error, demonstrable bias, clear outside-of-mandate ruling), high bar to grant review, and a clear stopping point.