Whether you run on a Mac or a PC, you need a two-button mouse with a scroll wheel to get the most out of After Effects 6.5. Powerful navigation shortcuts are now at your fingertips.
The mouse wheel will scroll vertically in the Composition, Layer, or Footage Windows .
Hold the shift key to scroll horizontally in the Timeline and Project windows.
Hold the Option (Alt) key down to zoom around your mouse point in the Composition, Layer, or Footage windows. In the timeline, this shortcut lets you zoom in time.
The Option (Alt) key will also zoom you around a selected track or mask point.
You don't have to have a window active, just hover over the window you want to pan, tilt, or zoom.