Hello, Laurie!
The short answer to your question is
yes!
When Walt Disney World first offered Free Dining for select dates in the fall of 2012, I noticed that the number of nights, people in the party and park tickets didn't exactly match what I needed. When I called to inquire about changes, I was told that there
are minimum requirements, but that the price quoted on the website is merely meant to be an example. Our package would include a four night stay for two people, and we only needed two days' worth of Park Hopper tickets, since our Annual Passes would still be valid for most of our stay. That was no problem, either.
I recommend that you call Walt Disney World at (407) 939-7414 and speak with a Cast Member directly about your particular needs. Don't forget to check out some of the basic details of the current
Free Disney Dining Plan offer as well.
Best of luck in booking that perfect Walt Disney World vacation! Be sure to send more questions when you think of them! I'd love to help!