Do you miss something on BrainKing.com and would you like to see it here? Post your request into this board! If there is a more specific board for the request, (i.e. game rule changes etc) then it should be posted and discussed on that specific board.
I had another look at chessvariants.com and it has some pretty strict rules for new contributors. For instance, the rule that the Inventor or the friend of the Inventorcannot submit new Chess Variants to them. And that one saying the game must be around for at least a year is a real monkey-deal as well -- though I understand their reasons.
I guess me and my Co-Exec will just have to find another way for Imposter Chess to take flight. Perhaps Fencer could consider adding it on BK in the future? Of course we would make sure to have all the proper rules in place before it got that far -- but it's a nice dream.