Hello,
Regarding the sync - are you talking about the thumbnails synchronization? Because the dials are synchronized as a whole, not by groups. Please contact me to my support e-mail.
I can advice you also about the CSS if you have a specific question. If you know CSS, you can just write it in the Options page to the "Custom CSS styles:" field.

Best regards,
Juraj Mäsiar

Hello,

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.

Best regards,
Juraj Mäsiar