Booking a flight using WP miles
 

I have a question that all you frequent flyers should be able to help us with. We need to book a flight in Aug using our miles. The only flight we can get is first class from BIS to SEA and on the way back it is coach class from SEA to BIS.
If I book this using all the extra points for the first class leg and a coach class seat opens up before the flight can I change it so I save some miles not using first class??
Thanks for your replies!

What I'd do is call Worldperks and see if they will swap the seat(s) for you. It's worth a try and in my opinion a better bet than being able to redeposit miles without paying a fee.