Background info:
http://www.megazine3.de/wiki/index.php/FAQ#Q:_My_book_moves_around_when_I_move_the_mouse.2C_what_can_I_do_against_that.3FI REALLY don't like having the book controlled by mouse_move, but at least one person thinks it's a better idea than mouse_drag. mouse_drag does have it's shortcomings, but I feel like it's a better solution for large books.
This seems like the perfect feature to include in the User Preferences plugin. The mouse_movers can just change the way my book behaves whenever they want, and I can suggest mouse_drag by making it the default option.
As long as we're making it a user setting, perhaps including scroll bars as a choice should be thrown in as well... but I feel like that option is a very very distant third place, so I don't care either way.
