One siege of each time limit where the queue is ordered by the rating of the challengers will give a "Top Dog" at each time setting.
This siege owner will not have to put up with endless challenges from weaker players. They will be guaranteed top level games at their favourite time setting. This will attract the strongest players.
It may also mean that the top players are less interested in the other sieges and give us weaker players a bit more space.
(sorry to repeat an idea i put forward before: i believe it to be a good one)
these sieges would also be best as a two game duel ..... each player gets a turn as white, because at those higher standards of play white really does get an advantage.
(duels would also be nice in open invites)
but i spose that is more work and testing for russ.
just reordering the queue should be pretty simple though.