Let us pick a default vertical location at which to load a comic
Frequently, there's a good bit of filler between the top of the page and where the comic starts; this filler is consistent from page to page. Comics that should fit on the screen occasionally require scrolling anyway. Let us set, for each comic, a default height at which to open each new page from that comic. Let the default be the most commonly-used height setting for that particular comic, but let each user change his comic settings individually if he wants.