BROKEN: Explanation here: http://****takaburi.com/blog/rip-delete-missions/. Unfortunately, the filter is extreme so you will have to fill in those asterisks yourself.

DO NOT USE THIS MOD! It will break your game, crash your client, rape your cat, and set 4chan as your homepage. If you insist on using it, I am not responsible for the utter destruction of your character, career, and musical taste.

This mod enables a little pause button to appear next to your active quest, but, let me shout this, IT DOES NOT PAUSE YOUR MISSION. IT DELETES YOUR MISSION. You will lose all progress, all quest items, everything. It will be as though you never grabbed the quest.

The only reason to use this mod is if a bug has caused your quest to be incompletable or if you never intend to complete the quest and you just want to be able to delete undeletable quest items. Note: This is only true for quest items that are attached to an existing active or paused quest. If your undeletable quest item is associated with a quest you already completed, your only option is to get a GM to delete it.

Installation:
Unzip into the ..\Customized\Flash\

Usage:
1. If game is already running, run "/reloadui"
2. Open missions window
3. Click the pause button on the right of the offending quest. Note: There is no confirmation or forgiveness. Know what you are doing.

Note: Does not work for the Story missions. A pause button will appear, but do nothing.