Extra points for using one of my favourite words.
Another possibility for setting up unusual formats of games is to seek opponents out on the ‘English Chat’ channel or in forums before setting them up by direct challenge.
Maybe the more extreme versions of board size should be limited to direct challenges and unavailable for general custom challenges but I do like that OGS offers as broad a range of possibilities as it does.
I have to disagree with your use of this word as I think @yebellz shows here: So many variations and repeated KO (2x2 game analysis) - #9 by yebellz