1. I tried to mimic as much as possible the look of side bars in OSX, the norm is not have this kind of lines. But I will think about it in the next UI design iteration.
2. It seems easy but has some side effects in terms of implementation, but yes, inline edit should be great.
3. I created a differenet UI them for OSX time ago because a lot of users complained about YACReader not looking native enought on OSX. In any case, this is something already scheduled. I want to add an option for using light/dark them.
4. The toolbar in OSX is a little bit tricky, this issue is specific of OSX and needs to be fixed.
5. Already implemented
It is working with minor issues in the development version. I would like to start to release development version binaries, so users can early adopt new features, if the new features are to unstable, you can always avoid using it.
6. Good point.
7. That was suggested during the beta testing of 8.0, I didn't have time for doing it. But I want to unify how these 'marks' look in the flow, grid and iOS.
8. This is something already scheduled and needs a lot of work
9. I thought about it, and I started implementing related things: you can mark a folder as a "uncompleted" for example, that means that you don't have all the comics. The integration with comic vine is a great idea for this.
Thanks for your suggestions!