Ability to Choose Different picture Sizes in the Same Book

Presently My Social Book automatically changes the picture size to small after a certain number of pictures/FB posts have been added. When that happened my total year ended up around 340 pages. Thus, another 160 pages would have been available. So, if I’d been able to choose a larger picture size for important events (wedding, vacations, etc.) I could have had a larger book with bigger pictures of those chosen events.