It would be great if you could have more than one mesh in a given container underneath the scene object. Right now I can delete the static mesh within the object/container, but, there is no way to replace it with a new mesh. I spent quite a bit of time with the lighting of the model in Sansar and then I discovered that I had a slight problem with my 3D static mesh collisions that I wanted to fix. But, the way it is now I would have to then redo all the lighting of the model which took considerable effort.
The ability to create complex objects with more than one mesh where you could replace the meshes would be a more flexible approach.