This seems very interesting, especially if used in combination with MV/Z3D.
While I doubt it already has a function to let the battle take place in the same map as MV3D, for example, is it possible to make the battles have more than one image per direction of the skybox, and/or ve layered? If so, I can imagine using something like SRD's pre-battle common events to change them right before the start of the battle.