Supposedly you can disable the 30fps lock by modifying a file named "user.ini", but I don't have any files in:
My Documents\My Games\South Park - The Stick of Truth
There's just a subfolder with the saves. Has anyone confirmed that this works? I didn't see a source for the tweak.
There are some config files in the game's Steam folder which look like they can be modified. However, I saw nothing related to vsync or framerate there :/