You select the file you want to add and there will be drop down menus so you can select the camera, lighting, environment much like you do now and it adds it to a queue.
I can then select a different model and do the same.
Once I've queued a few differnet models up I can leave the machine rendering overnight or over the weekend. THis would speed up rendering production considerably.
Builds on the idea here:
http://forums.autodesk.com/t5/Inventor-IdeaStation/Queue-renderings/idi-p/3905040