How do you change the quality of shadows?

Im happy with how the game looks and performs at medium setting.
However, I do not like the way the shadows look. They are ugly. Is there a way I can turn off the shadows, or change their quality? Is there an option for this in the config xml file?
Thanks
However, I do not like the way the shadows look. They are ugly. Is there a way I can turn off the shadows, or change their quality? Is there an option for this in the config xml file?
Thanks