Once saw a video on youtube of a guy showing off this dualboxing setup.

Video included:
- Dire Maul (I believe east)
- 1 Paladin, 3 Warlock, 1 Priest team.
- Used an interesting system. He cropped the 4 follower windows to be small squares, and line up those 4 small squares into a grid. He would then just quickly make small circles with the mouse on grid while spinning mouse wheel in order to cast shadow bolts at the tank's target

This was a very interesting set up and I would like to copy it but dont know how. Any leads?