Would it be possible? Sure; I think an author or two may have already done it in the past.
Personally it's not something I would want. To my knowledge such a modification would cause you to automatically accept that dialogue window each and every time, eliminating the purpose of the window. Yeah it's annoying, but it's designed to prevent mistakes. It'd be far simpler if SOE just coded the quests items so that they didn't trigger that confirmation at all (ie by using the code where one automatically drops for every person directly by the 'loot item' window)
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