Of course I have them named "cover.jpg" so just an option to have folder image customisable???

All the publisher logos I could find.https://www.mediafire.com/folder/lwy2ajsln6cic//Comic%20Logos

I'll get started :-)

That's a little more than I had considered. I simply wanted for example a Marvel logo on Marvel folder instead of the cover for '100th Anniversary Special Avengers'.
But it'd be very cool on a per comic series basis. Don't know about who by or how this info would be scraped. Is there a ComicInfo.xml equivalent for series?

On the cover.jpg incorrectly rendering, I've found the only solution that works for me is to unzip and zip again. No other file modification needed. A strange one I'll admit as file opens and displays fine.

Sounds good and reasonable. Whatever you can do... Love the program...

If multiple issues from same series added, only show series on latest comics page.

A Total Comics figure on web presentation page. A la "Now serving 1,234 comics"

a nice server stats page? Clients/Requests etc

Dolphin & Firefox both allow fullscreen viewing on both Android and iOS.