Who is the hotel operator? Did you ask at the front desk or call on the phone? They may not have the slightest idea what you can and can't do outside of the regular parameters of the dining plan. If you called the front desk, you spoke to a call center, and not even someone actually at the resort. Ask a cashier in the food court, and see what they tell you. It's generally allowed in the resorts, but may or may not be allowed at different places in the parks. There is also some reports that it can only be done once you have used up all your CS credits.