I just had another idea after reading about your “good” traders and “bad” traders.
If we can add “item identifying” to Stonehearth, we can also add quests about “trading known things for unknown things”. Like, “I want to exchange this sword of unknown quality for three fine wooden chairs”.
Then you trade it, identify the sword and discover it is of better/worse quality than you expected. Which means that this trader might have cheated you. Or maybe he didn’t know himself.
Or, we can place “requests” to the traders we have good relationships with. Like, “I’m in need of some clay for constructions, can you bring more with you next time? - Okay, but it will cost you these and these goods in return, and you must still buy it. But I will!”
If you have better relationships, you can ask more, they will ask less in return, deliver it faster and agree to your requests more often.
Sounds like a perfect improvement for Rayyas (love them).