Good afternoon and thank you for posting on the Final Fantasy XIV Technical Support Forums.

The above posters are correct (thank you for research, by the way). Unfortunately, there is no in-game option for doing an action on release of the button. You may be able to do this with a programmable keyboard/mouse by selecting what action are to be done when you release the button. However, this would be outside of the game environment so I'm not sure how the game will react to this.

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