Klaus are you planning of making some sort of automovement or arrows at the end of the thumbnslayer to show that you have more.
If its already planned I am not going to use my time trying to do it.
The problem is that auto onhover does not work on touch so it has to be something visible.
In reality it is only necessary if the thumbs ends up to match the ends and still have more unvisible. If you see a half thumbnail I believe even the most unexperienced will try to move it.
Hans