It's very annoying that this useful feature will not work as its name indicates.
For this reason you can not create styles Stroke shift path in one direction. According to me it's silly that you can not create unbalanced line as a graphic style.
http://cl.ly/image/3G0e1T080A1e
Or change its name does not "offset path" should now be called "Outline path"
Please think about this.
Regards!
North America
Europe, Middle East and Africa
Asia Pacific