I don't know if the layout of the menu has changed, but we ate there recently (5/5) and it was pretty clear what you could pick. There was an appetizer, sushi, entree/combo, dessert and add-on section. So when the waitress explained it to us, she said you pick an appetizer, entree/combo and dessert. It was pretty straight forward. So technically there are no 'restrictions', just other stuff besides your entitlements that you can add-on at your cost.