Hey, just catching up after Endchan downtime.
>>/522/
There is no way to do this at the moment. I am ultimately unhappy with how collections work in many ways and want to clean up and rewrite handling of multi-page content, both with explicit cbr-style file support and a virtualised 'single object, multi-file comic' cbr format to handle paged comics as single thumbs rather than auto-sorted files.
I apologise for the inconvenience in the meantime. The next time I am in that code, I will see if adding a simple double-sort system as in >>/523/ is easy to add, but if not, this may have to wait for the bigger rewrite.