You mean the cave nearby the Red Hammer Scrine ? The cave where you can also find the blue teleporter a little bit higher on that montain side ... I think it's the Svadivari Cave (?)
You can burn down all the Goblin Hut's and Ballista's of the Red Hammer Tribe ... go into the cave and spare the Goblins so you can have an extra trader, Timpuk
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I don't remember I can still trade with Timpuk when I go further into the cave (passing Timpuk, going to Svadivari (for the quest)), but I think Timpuk become angry and attack me so I loose a nice trader with him
...
So, if you love trading, don't go for the quest, but wait as long as possible.
Timpuk have great things you can buy, like for example Yewellery with Skillpoints on, and many more ...
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