I didn't like Two-Face's death in TDK at all. I really think it's a problem of the Batman universe that you can't simply kill villains off, while it's a usually pretty common to kill characters in movies. It's easy to give a bad guy a good ending if you kill him, but the matter is, Batman doesn't kill, which was something that really bugged me about both BB (when Batman leaves Ra's for death) and TDK as well as the 1989 Burton movie. It's a rule you shouldn't break, at least not without a very good reason and not without consequences, and those movies had none. So, if you can't end a movie without killing a bad guy, you shouldn't do a Batman movie IMO.
Hm, I can't find that script, but from what I've read, they revive Joker with fear gas? And Quinn is Joker's daughter? I'm kinda glad that wasn't made. Though I'm certainly interested in the script... At least some Scarecrow. There's not enough movies with Scarecrow.
Talking about him, I think he was the villain portrayed best in the Nolan movies. Only thing I didn't like was that I didn't consider him the asylum director kind of person, but rather something like "I hate this asylum and its director", but I guess that wouldn't have worked with the plot.