Its the same proceedure as BF2 (easily guessed as its the exact same game engine). Create a new Shortcut and right click it, click on properties and where it says target add somthing that resemblse the following

"C:\Battlefield 2142 Beta\" +menu 1 +fullscreen 1 +szx 1680 +szy 1050

Its no different than the Battlefield 2 partial solution, i havn't tried any FOV editing as it is more than likely ineffective.