Webcomic looks good. I've added it to my rss feed so I'll be reminded when it restarts.
Yeah, there's several ways to do it. Could also have a gallery unlock in the game that becomes available once the players has completed a certain amount of endings or something.
Cheats that let you manipulate stats would be my preferred option, 'cause I think scenes work a little better in their proper contexts, as opposed to a gallery.
But a 100% save file is probably the least hassle for you to implement which is always a big plus :D