Feature request: Ignore left/right margin difference on front/last pages.

[droberg]

As a user, when I print booklets i usually include some nice logo on the front- and back-side. This becomes ugly when there are differences between left and right margins.

Because setting different margins on left and right increases readability of the booklet it would be nice to be able to do some kind of combination where first and last page have same margins while all others have the regular setting.