The option for a freelancer to bid not just a price, but a structure for the project is EXCELLENT.
That said, would it be possible to add a "TBD" type option? While the current structure of one payment or milestones with the ability to specify milestones is great when sufficient detail is provided in the posting, it is often impossible to know how much work will be involved or at what points it would make sense to break the project into milestones.
That's the most beautiful thing I've seen in a long while - hope they roll it out to everyone soon. I would venture to guess that the majority of new clients (and even existing clients) don't have a clue as to how to set up their jobs. This would mean so much less confusion and angst for the clients.
Agreed, a TBD feature is most definitely needed.