I did exactly this when I was there on a solo trip about a month ago. Ordered the gumbo and pommes frites. It was way too much food, but I wanted to try both. It was a very pleasant meal and the waitstaff was very friendly. I didn't ever feel I was disaccomodating them.
By the way, since I was solo and could eat when the whim struck me, I didn't make reservations before the trip. I mostly called Disney Dining about 90 minutes before I wanted to eat at a TS restaurant and I had no problem making reservations for one at the time I wanted. Then when I walked up an hour or so later, I was seated right away whereas people just walking up were being told they would have an hour long wait.