The idea

An option to pad chapter numbers with a user specified amount of zeroes should be added to path placeholders.

The default behaviour should also be changed to automatically pad with as many zeroes as digits of chapters (i.e., three zeroes if there are more than 100, but less than 1000 chapters).

Why this feature should be added to the app ?

Chapter placeholder {chapter.chapter} returns the chapter number without any padding, leading to incorrect sorting if the application doing the sorting does not do so smartly:

$ find . -type f -iname 'saki*':

./Saki c1.epub
./Saki c10.epub
./Saki c11.epub
./Saki c2.epub
./Saki c4.epub
./Saki c40.epub
./Saki c41.epub
./Saki c5.epub
./Saki c50.epub
./Saki c51.epub

This also occurs with {chapter.volume}.