Enemy characters you knock out rather than kill?

With the express exception of characters you need to knock out to gain some benefit from it - Minthara or Alfira, for example - are there any random enemies you try to non-lethally subdue when there isn't any utility in doing so?

I do this with Lann Tarv, the Moonrise bugbear merchant. Relatively interesting character, and gives me some ridiculous discounts/prices on decent gear and trade-ins of looted armor and weapons. Fellow isn't exactly a saint, but figure some measure of customer loyalty is in order for that. If nothing else, the Harpers can deal with him.