You can specify that citations in a group can be sorted or not for both author-date and custom citation formats.
I tried to see these new options but it seams as if I blind. Also I could not find useful hints in the user guide. So I would be glad to have a few more details on this new feature. Thanks in advance.
In the format, Bib & Citations tab, the Order Grouped Citations popup is now at the bottom. The setting there will now apply to custom citations (before it was only author-date citations). The feature should really have been under the heading of More Versatile Sorting of Citations.