Not sure what that means. Not all WDW restaurants participate in the dining plan, but most of them do. At the ones that participate, you can order pretty much anything off the menu. There are a few restrictions but they are very few.
If you're on the basic plan you don't get an appetizer at table service for adults, on the deluxe plan you do.
Children are required to order from the children's menu if the restaurant has a children's menu.
Alcoholic beverages are not included (except at the dinner shows).
Not sure what else you might mean by "only certain choices."