Not within the API. I think that some more or less finished third party tools exist, that can do something like this, but i've never used them. Then again, it's pretty trivial to create something like this tailored to your needs. You can serialized/deserialize Object3D's using the DeSerializer in the desktop version and the Loader in the jPCT-AE to load them, but there's no such thing as a scene saver/loader.