Author Credits:
Credit to original author Renew. I stumbled across this addon called CrazyArrows and modified it to work with the current client.
Video from Renew:
https://www.youtube.com/watch?v=72XtWI3IqzQ
Usage:
When interacting with (Horde)Bounty Hunter Kolark or (Alliance)Artilleryman Sheldonore, upon clicking the NPC, one quest turn-in will be completed. Each click will attempt to exchange another stack.