With Slideshow2 everything went well. Download the package, edit the file like specified and voilá you’ve got an vertical thumbnail list. Life can be so easy…
… until you add additional pictures: With more thumbnails than the complete height of the container (around eight in my case) the problems reveal. There is no scrolling!
After some (read alot) try and error I wrote to the googlegroup of the developer and sent a complete error description and a way to reproduce the problem in. So stay tuned :-)