If I might enter one of my long time requests. Independent left and right pages. This is so important when laying out a book where the left hand pages and right hand pages have different gutter and outside margin spacing.

Right now if I make any modification to a text column let's say on a right hand page — move the text area to the right a bit, Xara wants to apply the change to both pages. If left and right pages were independent then the change could be made to only right or left hand pages.