Thanks for checking it out! While the view/history/router related code should be okay just sitting there unused, I agree that does seem like a bit of a code smell. I know Jeremy has been against modularizing Backbone in the past, and there is something to be said about keeping everything packaged nicely together in a single file - though maybe something like this would change his mind.

It's definitely something I'll begin to look into a bit, possibly splitting up the Backbone components into a separate library specifically for Bookshelf, similar to lodash's custom build process. If you have any ideas for a good way to go about this, feel free to open a ticket.