Exported movies can be cropped to reduced dimensions, and the movie automatically scrolled to keep the mouse pointer in view during playback.
How to make the export movie autoscroll:
In the Flash, AVI or WMV export dialog, select the Autoscroll tab
Check the Use autoscroll box.
Set the Mouse position option - the movie can either scroll to keep the mouse exactly in the center, or within a central area.
Set the Autoscroll frame size - if you have already set a cropping rectangle, the frame size will be set to this by default. You can change the size by entering dimensions in the Width and Height fields.