Great idea !
I'll do that.

Ubooquity does not care (in theory) about what kind of files are in the archive. It just keeps the ones it identifies as being images (jpeg, png, gif and, in a future version, webp).

If you can, could send me one or a few files that still can't be opened by Ubooquity after recompression ?
Email to: tom ' at ' vaemendis ' dot ' net

That great news ! :D
Let me know if you encounter any difficulty coming from the way I implemented the OPDS feed.
I tried to stick to the specifications as closely as possible but I found some parts quite ambiguous.

Could you take a look at your log file and check if you have some errors ?

For now I'm quite puzzled by this problem. So if you have time to "play" a little bit with the settings (try to share another folder, create another user etc.) and find some hints, it would help a lot.

Ubooquity never modifies the user's files (books or comics). That's a strong design principle that will not change.
So modifying comics metadata is not an option.

However, keeping the unred/read state of a given book in the database (as well as the current page number for comics read using the online reader) is something that can be done (and already requested a few times).
So why not.

I understand your pain. ;)

I'll try to add a setting bypass the base folder when there is only one.

Perhaps you have a firewall on the computer running Ubooquity (Windows has one by default).

On my setup I had to open/forward ports on the DSL modem, the router, and the Windows firewall.