This conversation has been merged. Please reference the main conversation: Lightroom: Ability to create custom book templates/sizes from scratch
The book module of Lightroom is an awesome tool to speed the personal workflow (especially of professional wedding photographers) massively up with the only limitation, it can't be used due to the Blurb limitation.
Please Adobe, we are asking since more than 5 years for an enhancement of the book module with the ability to create custom book sizes and templates. This update would increase the value of Lightroom in a professional environment a lot!