3D FlipBook - Hi, I just recently bought your great plugin 3D Flipbook for Wordpress I am having the problem, that I have a pdf file to

Hi, I just recently bought your great plugin 3D Flipbook for Wordpress I am having the problem, that I have a pdf file to show which has a regular size cover page followed by two pages which are only half a regular page, these are followed by regular double pages again. The two smaller pages now get stretched to fit the width of a regular page. Is there an option where I can change this? Thanks Wolfgang