Has anybody used UR points for an AS ticket and dealt with changes since change fees went away? I'm sitting on a pile of UR points and am starting to look at booking with them. With the dummy booking I started with it looks like the Expedia engine doesn't show as many flights and flight combinations as the AS engine to start with. When you get to the end it gives a notice that you can make free changes, but you can't cancel (even for F tickets) past the 24 hour window. Presumably the free changes to differently priced tickets will lead to additional points charges/refunds, but they don't state it clearly.

And another kind of trivial question about the UR booking - with as far as I went, it didn't have a place to put a mileage plan number. Is there a point in the engine where you do that or do you have to do it post booking?