I'm a Disney Visa card holder... and had a trip booked 11/22-11/27 to WDW. After seeing the dates for MVMCP, I called to add 11/21 so that we could do that as well. The lady I spoke with told me that if I add 11/20 as well I would get free dining for my ENTIRE trip! I was under the impression that free dining ended on 11/21 regardless of the length of my trip. Needless to say, I added the extra day and got a $400 refund because of the free dining! Thank goodness I called instead of altering dates online! 
