I don't know how to quote, but here are answers to your questions at least my understanding from the conversations I had yesterday with two different CMs.
1. BB offers for FD include value resorts except for LM rooms at AOA which are excluded. Value resorts qualify for QS so if you want DDP you have to pay to upgrade. The upgrade fee is approximately $20 per adult and $3-4 per child, per day at this time.
2.I believe you can move dates as long as there is availability and you are still within the correct timeframe of the offer.
3. You have to book the rooms while you are at WDW. You can book more than one room, but each room has to have a reservation in the name of someone (adult) who is currently at WDW. So if your FIL is with you for this year's trip, he (or you with his name on the second room as the "lead person") can book his room for next year and then cancel if he decides not to go next year, but if he's not currently at WDW you can't book a room for him for next year.
Hope that helps