There's a macro you can send before IWT so you wont have to do the extra step, just spam the key.
/run LootSlot(1)
/run LootSlot(2)
/run LootSlot(3)
/run LootSlot(4)
/run LootSlot(5)
/run LootSlot(6)
/run LootSlot(7)
/run LootSlot(8)
/run LootSlot(9)
/click StaticPopup1Button1
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