Re: first display on twinview
You can't set the first display using the ConnectedMonitor option. There's no real way to do it. For most people TwinviewOrientation "LeftOf" is enough. If you really want to make the dfp the primary screen you need to play with 'separate X screens combined with Xinerama'.
The CRT-X/DFP-X/TV-X corresponds to how the outputs are wired on the card. Useally the first output is just CRT-0 but in some cases it is CRT-1, further the '-X' thing isn't required.