I too haven't tried it, but I don't believe it would override the settings that have been set, it would just carry them out silently.
However, if you have them set to Ask that would be difficult to carry out silently, so I don't know if that would be classed as a fail and move on to the second option and should that fail on to the final option. So I don't know if you have also changed the 2nd and 3rd options in the shields to say 1. Ask, 2. send to Chest, 3. No Action.
Then there is the $64,000 question what happens when you close the game/full screen application, would you be presented with list awaiting action.