EDIT: nevermind, did not pay attention to your taskbar in the video that it's HKN and HKN wasn't part of the thread title before :>
prob Acidbiurning solution is the quickest in the case
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ISboxer is offering a special action for this: Send Next Click Action.
Call the button that's bound to Blizzard/RoF/Flamestrike. Then use the 2nd action "Send Next Click Action":
The latter will sync the mouse position across the set target until you either left or rightclick.
Also see MiRais GTAOE video for additional options:
https://www.youtube.com/watch?v=PsAIukHgWgo
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