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

Hello,
The thumbnails generation is very complex process now. Sadly the API that was available before for the SpeedDial is not available anymore.
There are three options for generating thumbnails and each of them has some advantages and some disadvantages.

But the best results are from the background reload - which works in the invisible tab. These thumbnails should be sharp.
This method is by default used when you add a new dial (unless you use "Add this page to dial" from context menu on a page).

You can also use reload by visiting page which also yields good thumbnails and it works on any page.

I will try to simplify the options in near future for easier usage...
Also feel free to contact me directly on my support e-mail.

Best regards,
Juraj Mäsiar