In the comics, and most notably BTAS, the Caped Crusader has often dubbed different disguises to extract vital information out of the criminal underworld. For example, Matches Malone is a well-known alias of his. If hes looking to attack the criminal fraternity where it hurts most, shouldnt he know everything important about them? This requires research. Bats needs to go undercover every now and then. This would be really cool to see in a movie. Matches Malone on screen or any other disguise. A master of disguise would be awesome in a Batman movie.