a tv can "display" any resolution you throw at it - just that 1280x720 will probably be unreadable. i find that on my tv i can only read text if its at 800x600 or less, so i would suggest using something like 800x450 if you want a readable display. As thats not a standard res, u might try entering it in the change resolutions > add custom mode thing in the nvidia display settings. But i dont know if you can adjust the main display and tv seperately though.
EP, glad to see you come back and tidy up...did want to ask a one day favor, I want to enhance my resume , was hoping you could make me administrator for a day, if so, take me right off since I won't be here to do anything, and don't know the slightest about the board, but it would be nice putting "served administrator osnn", if can do, THANKS