Darkwings

I remember that OneManga used different servers (at least 2) and encypted urls to safeguard their images.

Something like server A having the website, server B having the data, and a script ensuring that the only way to access B's data is from A's encrypted links (with sessions managing and longish nested dir trees).

A common crawler would end up missing pieces, pages or whole directories, especially if using arbitrarily nested directories just to add more jumps.
But that's also a big mess to manage.

It's still possibile to snatch B's data, but that would require manually browsing the site on the first server, following the links (by loading the script) and saving the images from the clipboard cache.
The idea of splitting/rebuilding the images would also add quite a bit of time needed to save the complete image.
Using print-screen to compose a picture can't be stopped but takes a lot more time

Can't think of anything else without requiring a user-restricted access (that would render the whole site somewhat useless) or being a complete 360° jerk.

Since laws can't help and ethics are something forgotten or twisted around by most, the situation is this crappy.

I'm supporting Ozarke's idea of highlighting unread chapters in some way

Edit: I was having problems unrelated to Batoto causing the reset of the language filtering. Fixed :|

Thanks for your hard work guys.