Hello,
Well it sounds crazy to have such amount of dials in a single group :D.
There were some reasons why to restrict number of dials in one group, but I think now with scrollable groups and improved synchronization it could be much much bigger.
I will try to upgrade in the next release 12.6 to at least 300 rows, but I'm not sure if there won't be some performance hit loading so many images in single group (especially when thumbnails gets bigger). Please let me know afterwards (you can contact me directly to my support e-mail). I'm very busy this week so I will probably have time for this the next one.

Best regards,
Juraj Mäsiar