I just started setting mine up. Depending on were the cursor is the scroll wheel will change what it controls. example… if you want to scroll through timeline put the cursor in the ruler. If you want to scroll the horizontally put the cursor over the horizontal scroll bar and use the wheel. hope this helps.
the scrolling for zooming and foward and backward playback has been a little jumpy for me. other then that i cant wait to do a whole project with it.