Re: In hindsight what changes would you do - Part 1
as much as I like TDK, it would have been cool if Dent didn't die. And if Ra's hadn't died either.
What if at the end of TDK, in order to hide his tragic downfall, they fake Dent's death and lock/hide him in a private cell/wing of Arkham (where he truly goes mad after 8 years).
In TDKR, Bane/Talia come to free not only Blackgate, but Arkham as well (because of the 'wrongly' imprisoned Dent which they discover).
Two Face, Joker, Scarecrow, (and perhaps Ra's himself, if he hadn't died) are all freed, and each gets their own little setpiece in the movie.