I’m not listing this as a feature request as I suspect that this may be more of a problem with Google than with Paperpile. I get alerts from Google Scholar which often link to individual chapters in Google Book search results. Like this:
http://books.google.com.tw/books?hl=en&lr=lang_en&id=PCFvBAAAQBAJ&oi=fnd&pg=PA35&
There seem to be two problems: (1) For some reason Paperpile interprets this book as a Journal, not an edited volume. (2) There seems no way to detect that Google is pointing to a specific chapter in the book, rather than the whole volume? I wish this was better, but I don’t know if there is much Paperpile can do to improve it?