Regarding the links in zoom: please keep in mind that the current zoom is actually more of a gallery function, so that's not really possible. You can still create links in the swfs you use as the hires image, though, and start out fully zoomed in to have them clickable (when zoomed out the dragging takes precedence).
I did an implementation of a different kind of zoom (actually scaling the whole book, loading hires variants directly into the pages) for someone, but that is rather specific to their environment, so I can't simply port it. I may add something like it to the engine some day, but no promises...