You know, it's probably the height of hubris to think that I've actually come up with a new (if limiting and flawed) approach to Batman, too. I'm willing to bet there are at least half a dozen stories where he knocks out a power plant and every back-up generator so that Zsasz doesn't get electrocuted. And Grant Morrison has read every one of them.
Actually, I can think specifically of one story where Batman cleared the Joker of a crime he didn't commit so that "Gotham State" or whatever state it was wouldn't execute him. Although that's a little different, since presumably he'd have let it happen if the Joker had actually committed that specific murder that he was sentenced to death for.