Comment 7 for bug 527428

I just tested this again in natty.

I can confirm that adding the "RandRRotation" option to the xorg.conf file manually makes the setting appear in the nvidia config tool. However, when you try to rotate the monitor it crashes and this is displayed on the terminal:

The program 'nvidia-settings' received an X Window System error.
This probably reflects a bug in the program.
The error was 'BadValue (integer parameter out of range for operation)'.
  (Details: serial 314 error_code 2 request_code 154 minor_code 2)
  (Note to programmers: normally, X errors are reported asynchronously;
   that is, you will receive the error a while after causing it.
   To debug your program, run it with the --sync command line
   option to change this behavior. You can then get a meaningful
   backtrace from your debugger if you break on the gdk_x_error() function.)