We really need to be able to better organize the wiki pages, group of pages and subgroups of pages in the generated PDFs. There is both the need to have single wiki pages mapped to whole chapters (bug 28066) and the need to split a PDF into sections formed by many chapters (each of them being formed by either a single page or a groups of pages).
The support for section was requested e.g. on these pages:
The support for chapters made up of individual pages (bug 28066) was requested on:
The original report on PediaPress bugtracker can be seen on
is also related.