Hi Maru
About object merge, it was just a thought, the script is not merging any object on the scene.
I have uploaded trough the dropbox private uploader, both the scene and the scripts, with the name daniel diaz del castillo, and email contacto@arqrenderz.com
Just drag and drop the two scripts to max, the category should be arqrenderz on toolbar, the script is called camera lister, put a shortcut to it and the rest is just like the video on this post.
Select the first camera, run interactive, while interactive on select the second camera and the bug should appear.
Hope it helps