So, this seems like a bit of a cop out suggestion but there is literally NOTHING else on Quesh anywhere o.o Literally its only use is apparently that the Republic once allied with the Hutts there to try and make adrenal stims out of the toxins in the atmosphere, but that eventually turned into an abandoned project when the Empire found out and attempted to take over.

Soooo....unless The Faceless want to attempt to take over the facility there in order to have the monopoly for adrenal stims....though I can't see why they would want to cause....why would the Qyaari need adrenal stims when they have the Force right? XD 

Or I guess they could use it as a prison/execution site for non-Force users if they're gonna start going down that route again but meh, we kinda already did that in Act I and I don't think Soto is that stupid to try something that clearly didn't work the first time? o.o though I do stand to be corrected of course haha