Well, I can't help you with numbers 1 or 2, but the Overscan issue can at least be temporarily dealt with via your TV settings. More than likely, you have your TV set to 16:9 picture display by default (which on my Vizio TV is just called "Wide"), which is the standard aspect ratio for HD resolution. What you need to do is to open your TV's Settings and set the Picture mode to 1:1 (which on my Vizio TV is just called "Normal"). That should mostly fix the Overscan issue, though hopefully Nintendo will fix this self-inflicted problem themselves in a Wii U firmware update because neither of the other 2 HD consoles have this issue.
Number 1 bugs me as well (no, Nintendo. If I'm using the Wii U, the TV is the important thing to be looking at, not your latest gimmick-focused controller), but yeah at least you can easily flip the screens with the push of a button.