TBH, I'd completely forgotten that
author_avatar_cover setting existed, so I have to go read code.
Okay, defaults.ini specifically has
author_avatar_cover:false under
[base_xenforoforum].
So you have to turn it on in personal.ini for
[base_xenforoforum], or more specific (it won't work in
[defaults]):
Code:
[base_xenforoforum]
author_avatar_cover:true
## or for the story url specifically
[https://forums.sufficientvelocity.com/threads/scaling-up.57243/]
author_avatar_cover:true
Beyond that, the cover generation system has grown hopelessly complex and I don't remember most of it. See the
Cover Settings Calibre Plugin wiki page.