Nothing annoys me more than Hollywood insisting on maintaining "historical accuracy" when casting whites-only to depict historical honkies, but when depicting historical figures who were non-white, well, they make exceptions. All the major Hollywood films cast Jesus as a honkey, when the bible describes him as having "hair like lamb's wool and skin like polished brass."
When Hollywood famously cast Elizabeth Taylor to play Cleopatra, what they got wrong wasn't her so-called "race" but rather her physical appeal: Cleo was a honkey chick, but her beauty was all in her remarkable personality.
What I would like to see: black folks playing all manner of historical characters, including Napoleon. And of course: where's the movies about the slave rebellions? Amistad doesn't count, of course; they need to refilm it and this time focus on the rebels.