You can ask, but I wouldn't count on it. Keep in mind that the Kids Dining Plan cost is so low that the snack plus half of the CS meal pretty much covers the cost. So that is why so many of their options are so inexpensive. With proper planning, you can stay away from too many mac n cheese's though.
ALL BUFFETS will allow your child to have any of the offerings (not just the kids stuff) - so salads, fruit, seafood, pastas, red meat.....This is a good idea for your family.
Sunshine Seasons, Wolfgang Puck Express, Mainstreet Bakery are some good CS options that offer non-traditional kids meals.
Just stick to a plan that gives your kids more variety. We usually do both - a few choices focused on kids choices and a few that Mom and Dad want (so they'll end up with the usuals a few times on the trip).