It works with any application! Download it, select the desired activation method going to Activator preferences (Settings -> Activator), open an app and activate PhyScroll. Then you just need to tilt the device/press the volume buttons to scroll!
You can change between the scrolling methods (accelerometer and/or volume buttons) in PhyScroll settings. The acceleration rate of the accelerometer scroll and the size of the volume scroll is also configurable.
If you are using iPad, you can enable manual scroll selection. This option will ask you in what scroll you want to activate PhyScroll, and it’s useful for applications that have multiple scrolls, like most of the iPad apps.
Check out a video of PhyScroll below. You can purchase the tweak for $1.99 from the Cydia Store