A "Made for iBooks" eBook would really make something like this pop. imagine a map where taping any pin in it brings up putties or text about that point of interest. highlight text or color text that scroll through their boxes rather than take 2-3 pages if column space. Crop a picture to showcase one character but when taped it opens up to become full page with a whole second theme behind it. Un Shadowrun things like the comments section could be collapsable, the use of small icons could be used inline with text to allow GMs more info about a subject and the entire document can be hyperlinked within itself and to the internet to allow traders to click a word in a weapon definition and be taken to the appropriate rules page. Once you except that a "page" in a "document" no longer has to follow the old ideals everything becomes possible. The iBooks Author tool is free to use and and very easy to understand, especially if you've done page layout.
Pick up one of the "Made for iBooks" from Games Workshop to see just how much that medium can be expanded.