Nope. Nvidia's BLOB only offers a control to adjust the overall size of tvout (overscan). And if you have an 8x00 series GPU, you don't even get that much, the overscan control does absolutley nothing(!). I believe Windows users are complaining about the same thing and getting the excuse that it's down to Vista's DRM - it's been a long while since I bothered to investigate though, maybe my mind is manufacturing that explanation. The overscan control is definitely useless on 8x00 GPUs (and possibly later GPUs also, I don't know for sure) though. And there is definitely no existing option to adjust tvout position. Sorry.
I actually downgraded from my 8600GT to a cheapo 7200GS for a while because I was so fed up with not having an overscan control. Eventually I wanted a GPU worth a damn again though. Hooray for MPlayer's myriad command line options which can be used (in a maddeningly senseless manner) to shrink the fullscreen output so 1/4 of the picture isn't lost off the edges. Boo for the other options that appear to offer a position control in the manpage but don't actually do anything when you try them.
edit: the overscan option, if it works for you, is:
Option "TVOverScan" "0.7"
where 0 is the lowest and 1 is the highest. I believe it only recognizes one decimal place.
Last edited by lurko; 12-17-2008 at 11:04 PM.