If you check
Mouse Wheel Scrolls Graph View in the
Preferences you can scroll the state machine in the view vertically. It would be consistent to allow horizontal scrolling too, like other programs do. For example
Photoshop: If you hold
Ctrl the image scrolls horizontally. Because in this case, if the option mentioned above is checked, the
Graph View zooms in and out while holding down
Ctrl, it would be also okay to use
Shift for horizontal scrolling (in both cases of this option).
It's just a suggestion for better user experience.
Regards
Gustav