If you are so inclined and are at WDW during the busy season like Christmas, there are stories of people who hired on as seasonal cast members; one of the perks of which is the cast member discount at the Fort. It might be good to defray the costs of your staying by putting working part-time there.
The 30-day limit holds true and the rate is based on whatever you can get each day. You might want to look at getting an Annual Pass for one of your party so you can possibly get an Annual Pass discounted rate at the Fort too. You just have to do the math and see if it makes sense for you. Personally I think 2-3 months in the fall would be s-w-e-e-t
Bama ED