I have a MacBook Pro that is connected via VGA to a external TV that is an LG (model 32lh2000) which has 1360x768px resolution.
The problem with that is in the TV the resolution isn't high enough. Icons, folders, windows are too big and I can't take advantage for the big size of my TV comparing to the 13" MacBook Pro with 1280x768 resolution there's a bit profit. I've tested with a software call "Switchresx" but not work properly, the custom resolution that I created doesn't ever show up. I don't know if there are another solution or simply there not.