Being able to trade multiple items as been a wanted for years. i saw many post online asking if it's possible to do so with or without 3rd party tools. And the short answer is no.

Should there be one?

Because some npc Like Detrovio, Divainy in west adoulin is a pain to do especially when you want those sweet sweet augments in game early end game and to be honest it took me a few hours getting some good augment and trading over 400 stones+

But it's not the only location where you have to trade mulitple items quest/NM/etc...
I think it's time to implement the Macroing of multiple items.