On the issue of slavery, no it isn't legal. Humans used to be slaves during the first era, so they would naturally hate the idea of slavery.
Edit: Comedic relief, they're the emergency food supply.
Edit2: Though it is easy to change, if it seems against the human nature.
Edit3(Hat trick): I think I'll change it, I'd have to ship those people to Black Marsh or Valenwood anyway.