Maybe try MetaModes "1152x864,800x600@800x864"? Your TV will still scroll, though.
AFAIK there's no way to use MetaModes and not have the TV scroll. What MetaModes does is create one large screen (in your case, its resolution is 1952x864) that's split across both heads. It has to be one screen so that acceleration works properly (I think), and since it's one screen, it has to be rectangular. Which means that extra space at the bottom of the TV has to be there, and the TV will scroll.
Maybe if you just used Xinerama? I'm not sure if that's possible, though.