I think it should be noted that not everyone may be able to add the FD to their current reservations without having to make some change. This happened to us a few years back. We had a reservation at a moderate, standard view and when we tried to apply the FD to our existing reservation, we were told we had to either change our reservation to a water/pool view or switch resorts as there were no more "standard views" available at our current resort that would qualify for the
free dining. Sounded ridiculous to me, as we already had a standard vw booked but that's what happened. Similar thing happened to friends of ours who were booked at the BC, garden view...when they tried to apply FD to their existing reservation, they were told they couldn't and that there were no more rooms available for FD at the BC and would have to switch resorts completely if they wanted FD.