I just took a look and the book doesn't give a true interval beyond "every 3rd oil change". Since the computer manages how often you change your oil, at least in theory, it'll be hard to say change it at this milage.
As for being a better driver with a DCT vs a Manual. I'd say no, someone who's going to be careless is going to be careless no matter what the transmission is. I honestly think I get to the point with a manual as a daily driver where I give it no more thought than I did with any of my SMG based cars.