OK, just for fun (and after precious little sleep, and a long time staring at the park in google earth) came up with a fifth mountain idea...thought I'd share.
Would be in Toontown, replacing Gadget's Go-Coaster (bear with me, I like GGC) and the size of it might carry it over the DLRR track, but that shouldn't be too much of a problem.
Gumdrop Mountain - a mountain made entirely out of candy, through which a gentle coaster runs. The ride would be no more intense than GGC, but would course down marshmallow fluff drifts, past gingerbread towns, through fields of pepperment, and into rock candy caves. Each environment would be accompanied by the matching scent, similar to Soarin'.
I suppose the only problem would be the cravings....