For hydrus to do manga, there are a few things that need to happen.
first, hdev,
http://comicrack.cyolito.com/
This is as far as I know no longer updated, but it is hands down the best comic viewer I have found, at least for porn. set up a test folder, put maybe 100 things in it of you have that many and play around with the library, this is honestly almost perfect and may have somethings that could make it into current hydrus.
with that out of the way. how hydrus deals with manga/comics/hentais would need to be user readable. currently hydrus sorts everything into hashes (I believe) and if it did that with archives… see pic related.
this would mean that I can only ever use hydrus, as this is not user parseable at all, if hydrus ever shits the bed, that's that, I may as well redownload every manga I ever downloaded, every porn I ever downloaded as I'm never finding them again.
personally, I think this could be done fairly easily.
separate out comics, manga, and porn.
a comic would be sorted by character / team
manga would be sorted by property
porn would be sorted by author / primary / book name
these would be the folders. from here you have manga name or
porn author name / books chapter
comics need someone better then me to tell how to do that.
hydrus would effectively be sorting the books into user useable names and sorting methods, on the chance hydrus ever dies, its transferable to another program with ease, or in the chance another program comes around that does this better, it's also useful there.
from here, hydrus would need to either pick a page 1 automatically, or manually be told a page one so that it could display that I mean lets be honest here, I have 48903 mangas/archives, in comic rack, and that's just the ones I noticed/bothered importing, that is likely upwards 2 million images, and as much as I would love to have a hydrus style dup detector for hentai… and I would… this is just a bridge to far to do that again… not another 40gb of just thumbnails… I can deal with that for the image archive being 80gb on thumbs, but not the manga.
from here, if I am correct, the db side of panda/e-hentai is 117mb, it wouldn't be unreasonable to ship something like that with the manga/comic/hentai version of the program.
from here, you have tagging of volumes, the public tagging, the private, and the per image/where X happens.
This would necessitate a split off from the image version of the program, though with a shared codebase so that if one gets updated they both do, lets be honest here, aside from archives, image sets, and user parseable, any work done on the image hydrus would also benefit the non image and how often would work specifically for the non image one need to be done?
at least this is how I see it.
I was more then happy to use hydrus for images as that was an unmanageable mess that it made more manageable and partially tagged, but manga… that's VERY user sortable, same with hentai, I wouldn't put those in a program that made them no longer user sortable, I mean let's give an example, I downloaded from mangatraders, and because of their retarded numbers at the beginning of the mangas, I just ended up re downloading the things from other hosts that didn't do that because it was easier than renaming.