Well, learn to scroll, and substitute the if arrow key pressed blocks too if mouse x is greater than or less than a certain number:
[blocks]<if><( <mouse x> <<> 0 )>[/blocks]
[blocks]<change{ ScrollX }by( -5[/blocks]
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Check out this project by tycoon32...
http://scratch.mit.edu/projects/tycoon32/180483
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