Being able to render the game's 3D elements at a different resolution (say a percentage) from the native screen resolution. 


This way people with low-end GPUs (laptop users for example) can gain performance without blurrying the interface and those with beast machines can use supersampling as an alternative to anti-aliasing.


Also, it'd be nice to actually have a real graphical option menu in-game.


Example of games with this option: Planetary Anihiliation, DOOM, ABZU, Shadow of Mordor, Overwatch, Batman: Arkham Knight.


Thanks for reading.