As for villians, Nolan pretty much covered the ones that fit into HIS universe
Scarecrow, Two-Face, Joker, Raz Al-Ghul
the ones left are
Penguin, Riddler, Crock, Poison Ivy, Bane, Mad Hatter, Scarface/Ventriliquist, Clayface, Man Bat, and Mr. Freeze. Most of these are far fetched and unrealistic. The penguin I can imagine as an intelligent crime boss, Riddler is more realistic in the cartoon, Crock is realistic in that he only looks like a crocadile but is in fact a man with a skin disorder who happens to be really big, Bane...please, Mad Hatter could be good..i always imagined robin williams as mad hatter..there is a line between nolan and camp here, Scarface..meh, Clayface..meh, Man Bat too far fetched, mr freeze..a great character with a good tone, but unrealistic. Someone should say something to Nolan about Robin Williams though..they worked together on Insomnia where Robin Williams was a villian..who was really similar to bat villians in that he left clues and stuff. fine line as said above, but i've seen Robin play regular people as well as goofballs.
I wish i was a producer, i'd make a live action tv series. Did anyone ever watch Mantis?