The Artist Point (not Whispering Canyon) dinner was discontinued a couple of years ago. Don't know anything about Flying Fish but I heard it was advertised in the restaurant itself and nowhere else.
There were no choices for the soup or salad, but two for appetizers, three entrees and two desserts. It is a lot of food. Only thing I did as a "substitution" was order the cobb salad without the egg. I do not think they will let you order an entree that is not on the menu because they probably don't want to go over their price point - children may be an exception, but children's meals are not expensive. (For an allergy or medical condition I'm sure they will make an accommodation)