/click StaticPopup1Button1
That will do it, wonder if it can be added to an all-in-one loot macro.
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I haven't tried it, but this should work: http://wowwiki.wikia.com/wiki/API_ConfirmBindOnUse
I use the following macro:
#showtooltip
/use Findle's Loot-A-Rang
/click StaticPopup1Button1
Usually in my case, 3/5 toons will loot the first time, then I wait for the Loot-a-Rang cooldown(3 seconds), hit it again, and everyone has loot. And this is not my creation. Full credit to Multibear/Deimon on the Isboxer forums.