Not that I know of. You will find various car rental companies in the resort in DTD. Some even provide shuttles to pick you up and bring you to their office. I believe Budget (at the Doubletree) does that.
You can also rent from Alamo/National at both the Car Care Center by the entrance to MK and at the Dolphin Resort by Epcot. CCC does provide a ride back to their office (and return ride at the end), the Dolphin does not.