As suggested.... You could split your stay. If you booked 2 5-night stays... You could then use your credits over 6 days. Not over all 10 days... But you could use them from check-in day, to check out day... So 5 nights, used over 6 days.
That's as much as you can spread it out.
Fact is, if you could do what you're suggesting, then everyone would do that. Most days and meals are not saving money under the dining plan, at least not for adults. You really have to dine in a very specific way to save any real money under the dining plan (always want dessert and beverage with every meal, always want full lunch and full dinner (never want breakfast instead of full lunch or full dinner..), never dine at signature restaurants or shows, do dine at lots of lunch and dinner buffets, never drink alcohol instead of a soda, never order an appetizer as your meal, and almost always order the most expensive entree on the menu.
