[eriqjaffe]

Will we be able to create a "playdown" scenario?

In a perfect world, the ability to choose between a round-robin tournament or an playoff bracket (albeit one where the losing team is the one that "advances" to the next round) would work for what I'm envisioning.

There is a real-world reason for at least including a round-robin: In Honkbal Hoofdklasse, the bottom four teams play a round-robin tournament and the loser of that tournament is the team that gets relegated, so it's not necessarily the team that finishes a the bottom of the regular season standings.