Heyy Firetix, i just watched your video, and it gave me an idea.
Basically using your idea for the 'dummy' files, lets do it the other way around.
So the main movie and moviename.jpg REMAINS the same.
So eg Avatar.mkv will have normal thumbnail called Avatar.jpg this can be either the thumbnail generted by the Hub or a custom one created by thumbgen ie the same as your folder.jpg
Now the moviesheet part
We create a new dummy file called for example movie.mkv_sheet.mkv this can be created using a simple text file and renaming it to .mkv or another format that matches your movie file.
We then create a moviesheet for the MAIN movie using Thumbgen and output it as normal to movie.mkv_sheet.jpg
We would use the following command in Thumbgen in the naming options
THIS SOLVES ALOT OF ISSUES, NO MORE NEED TO CREATE SEE THROUGH MOVIESHEETS AS YOUR MAIN MOVIE WILL JUST SHOW THE CUSTOM THUMBNAIL ALLOWING THE INTERNET BACKDROPS TO SHOW.
IT ALSO MEANS THAT IF YOU RUN 'GET INFO' ON THE HUB YOU WILL NOT WIPE OUT YOUR MOVIESHEET AS IT WILL ONLY OVERWRITE THE NORMAL THUMBNAIL.
If you use folder view the first file will always be your main movie and the second file will be your moviesheet.
Just move across and you instantly see your Moviesheet. This will be a normal static background. Goto back to the first file and you can view your movie.
If you use All view then you WILL GET 2 Files per movie, the first will flash up a BIG THUMBNAIL in the middle of the screen allowing you to see all the other movies at the bottom and the second file will be your moviesheet once again this is a static picture filling up ALL the screen, move across one more time and view the next film again a BIG THUMBNAIL flashes up in the middle of the screen and you can see your other movies.
I will put up some pictures in a bit once i put some finishing touches to my theme
So we would have the following files
moviename.mkv (main movie)
folder.jpg (custom coverbox)
moviename.jpg (Custom thumbnail can be the same as folder.jpg)
moviename.mkv_sheet.mkv (dummy movie file)