By definition, all mail-in voting is extended voting as well.
You're correct. The longer you keep the polls open, the more opportunity for cheating. It's like night following day.
Well, I’m not necessarily a big fan of mail in votes. I’ve never cast one myself. I consider election to be something I’m called on to participate in, and I schedule accordingly. I know some folks can’t, so I’m not dead set against them. I would like it for good cause though. And then again, how do you determine that?