I'm not sure I understand, but if you want to be able to scroll the thumbnails, you can go to Options page, and to the field "Custom CSS styles:" enter this:
.dials > a > div { overflow-y: scroll; margin-right: -29px; }
That will enable scrolling of the dials, plus hides the scrollbar. Alternatively, if you want to see scrollbar and only when it's really needed (when the image is long enough), you can use this:
.dials > a > div { overflow-y: auto; }
If you mean something else, please contact me to my support e-mail.
