Ответ: Спуск полос из book'а
Мне кажется, что надо этому плагину сделать апдейт. Кажется у них (на alap.com) об этом было написано, хорошо не помню. Сам делать спуск полос из book'a еще не пробовал. Вот цитата из alap.com
Now with support for InDesign Books and CS
Imposer Pro is a plug-in for Adobe InDesign that imposes document pages into printer flats. Imposer Pro offers six sheet types (2-Up, 4-Up, 8-Up, 2-Up Consecutive, 3-Up Consecutive, and 4-Up Consecutive), four binding types (Saddle Stitch, Perfect Bound, Stacked, and None) and five imposition types (Standard, Work and Turn, Work and Tumble, Split Web, and Sheet Wise). To meet all your imposition needs — such as using different imposition methods for the same document — you can choose which pages to impose and how many signatures to create.
New to version 1.1 is the ability to impose multiple documents from an Adobe InDesign book, thus eliminating the single document imposition limit.