Update
Just wanted to give everyone interested an update on my situation...and it's GOOD NEWS! To recap, I have a 2 Bedroom Villa reserved at the Beach Club from 12/9-12/16. When I called to find out about adding the Free Dining package to our reservation, they told me we couldn't do it unless we moved to 12/10 as our start date and that there were no 2 Bedroom Villas at the Beach Club available for the discount. We would have to change hotels to Saratoga, OKW, or the AKL for a 2 bedroom or split up rooms, which turned out to be more expensive. We really wanted to stay at BC because it's our favorite resort.
So I decided to send an email using the Contact Us page on the disneyworld.com site. I basically said how disappointing it was that we couldn't apply the free dining to our existing reservation, which by the way is one of their most expensive rooms. I said how I understood that they use the discounts to draw in new reservations to hotels that were not booking up but that we should be able to apply it to our existing reservation.
Well I got a call yesterday from a VERY nice agent saying they have applied the free dining to our existing 12/9-12/16 reservation. It's nice to know Disney is still keeping up with their excellent customer service reputation. Needless to say, our entire party is thrilled to be saving close to $600 per couple since we were going to buy the dining plan. For us, we have 4 adults and 1 child that will be a year going, we really wanted the dining plan so we could enjoy places like Le Cellier, Narcousis, and Chef Mickey's among others.
Just goes to show, you never know and it can't hurt to email customer service, especially when you already committed the amount of cash we did for our vacation! Now we just need to wait 5 more months.