One feature I'd like to see is whether a game supports higher than 60fps framerates. A lot of games (such as 2d games) lock the framerate at 60fps and those that don't lock it have problems at higher framerates (skyrim and super meat boy have physics tied to framerate. Both games break at 120fps). Yet other games have problems going above 60 fps, such as Saints Row III due to the game being highly CPU dependent. And other games might have a way to uncap the framerate. There are also games like Rogue Legacy which are exemplary and support silky smooth 120fps in a 2D sidescroller game.
As more and more people get 120hz monitors you will see a demand for this feature. Why not add it now?