i'm not looking for an argument, but i am not sure i agree with you...
disney is giving
free dining for a reason... to get all those other dollars that a guest spends when enjoying the free dining... souvies, cocktails, park tickets, etc... it goes way beyond the cost of the hotel room... disney is getting NOTHING except the cost of the hotel room if the guest leaves two days early... disney is not a benevolent organization, they are offering free dining for a REASON! maybe there's not "rule" that says you cannot do what the OP suggested, but it's pretty obvious disney's intent is not to have the guests eat and leave...
same thing for DME... they offer a free airport shuttle not because they are benevolent and care about their customer's bottom line, but because money otherwise spend off-site and on rental cars will now be spent at disney!