For my real game I am using blender as my scene editor. And wrote a post-loader utility class to auto load my scene in JME and did all my conventions there (ex: model loader based on place holders from blender, LOD loader , Navigation Mesh loader for path finding , Cinematic Motion Path loader , Bone Attachment loader and so on). I create my scene in blender and links models to scene (using blender proxy) and when i export scene i just export Place Holder of models in scene (PlaceHolder is just an empty node with the name of model and it’s location and rotation) so my whole scene size after export is lest than KB. And in JME i load scene and read all Place Holders then add corresponding model based on it’s place holder using my conventional post-loader .
Using this way i could simulate SDK’s scene composer model linking.
And for exporting from blender to JME i am using Xbuf exporter.
This is a demo of all i explained above