Having examples like that is really useful for us to fix the problem. Thanks, Finestela! We'd also like to appeal to anyone else to give their feedback regarding this.
2. Some series have released Tank Vol. 00 or Special. (Again, Ubel Blatt
Definitely need real numbers for tankoubon volumes. (e.g. Prince of Tennis has 10.5, 20.5, etc.)
3. Some series have wierd chapter numbering system (Moonlight Act, which has a sub-chapter number assigned when it's the same story arc).
So true. Another example is Shiki, which has sub-chapter numbers for different story arcs all happening at the same time. There's almost no way to number the chapters sequentially except by arbitrary assignment (which is what SC is doing). So, having the magazine year/issue number would be a great help. (e.g. JSQ 2008 #12).
4. Special chapters are not usually numbered (Bamboo Blade, which has tons of special promotion chapters in Shonen GanGan, doesn't have numbers to go with it).
Yup, Specials are not numbered, but sometimes, it helps continuity to know when they were published, or between which chapters of manga, as c_k mentioned in the first post. (E.g. Vampire Knight). Especially when newer characters appear in the special. Sometimes, special chapters are only published in tankoubon too.
Basically, special chapters need a text field as the chapter #.
Continuing from Finestela's list~
5. Negative numbered chapters (e.g. Bleach). While the past story arc (-108 to -97) needs to be kept in the continuity of the other chapters, there were a few other special chapters that were negative.
6. One-shots shouldn't be labelled as chapter 1. They should have the magazine and year/issue number it's published in. Sometimes, the magazine doesn't have an issue number (e.g. Akamaru Jump 2007 Winter) so it can't be a numerical field. Though sometimes, the user may not know where it was published. ^^; So, one-shot can be another type of release (apart from chapter/volume/etc.)
