I realize this is the off topic area; I was just curious as to what had brought on a discussion of Blade Runner. It seems like a fairly random thing to ask about.
Replay value: I just saved a lot and went through most of the endings without having to do much replaying. However, I'd like to point out that the game gives you at least one hint as to whether or not you're a replicant. Just because you're a replicant sympathizer doesn't necessarily mean you're a replicant--you might just believe you're a replicant.
The basic idea is that, if you ESPER one of the photos that seems to prove that you're a replicant, you either (1) find no inconsistencies or (2) find an inconsistency which proves the photo is a fraud.
I don't know about the whole scorpion thing. It makes sense, to be sure, since otherwise you'd be dead.