i have just used this trick on Lovis and he opened his chest for me. (The chest on his right, u can only get access to it via mindread) In addition all the traders lovered their prices with this trick and i can opened Locke's talking wagon.
I always save my game just before talking with someone and try the normal mindreading and look for what happened after that. Later i load and try my trick this time, then go and check if it worked or not. So far it worked as it supposed to do with me. But as i said before sometimes u can corrupt your quest, because when u use this trick it ends your conversation before talking all of the options. And sometimes immediately after the talk u start to fight and have to kill that NPC, so u can never talk with them again. But away from that it works like a charm.
I hope this information can be helpful for all of u.
