I would also like this. You can make a 2 stage tournament through the API by setting tournament[group_stages_enabled] to true. However it defaults the first stage to round robin and there is no way that I know of to change the format on the first stage.
I would also like this. You can make a 2 stage tournament through the API by setting tournament[group_stages_enabled] to true. However it defaults the first stage to round robin and there is no way that I know of to change the format on the first stage.