Allow custom resolution and framerate caps.

So... I'm making YT videos, and I plan on changing the aspect ration of my videos to 2.4:1 (1920 by 800 pixels). I changed the resolution through settings.xml (as the game itself does not allow custom resolution). But when I download any sandbox, the game's resolution changes back to 1920 by 1080 @60 (the in-game settings also displays so).

I also want my framerate cap to be 30 instead of 60 because that is what my videos will be at and I will have only half of the rendering load on my GPU.