DH (who has NEVER participated in ANY planning for ANY Disney trip we've taken, at least until this year when he decided he was going to spend an entire week playing golf) had an idea: "Why don't you look it up in one of the 5,000 guidebooks taking up space in the living room?" So. . .according to the 2010 Unofficial Guide, Palm and Magnolia have "food and beverage carts". Not sure what this means, I'm thinking hot dogs and cokes? No mention of dining plan in the guide so I'm guessing not.
Although the pro shop and support facilities adjoin the SOG, the dining facilities at SOG are accessible only to active duty and retired military (I called SOG to verify but I might call back later and see if I get the same answer).