I am with Jamie G. I'm installing this regardless, but a Double Elimination mode will bring this Mod to a whole different level, and a lot more useful for gaming communities out there that want to run online tournaments the way it is done at a competitive level. I'm willing to assist in any beta testing for this to happen.
As for Pay to Play, I like the concept, not the name lol. But adding the option to make the tournament a Paid or Free tournament is a great addon, as part of the incentive for tournaments is usually prize money, which can easily be obtained via Paypal or similar method.
Just my 2 cents!
Kasht