not sure if this is a bug or unfinished content or what but in the quest "cat-catchers on the road," shenjirra gives me the key for the andas estate slaves' bracers. when i go to the estate and talk to the slaves, i can select the "go free" topic, and they recognize that i have the key and ask me to use it to unlock their bracers so they can escape, but there's no dialogue choice to actually do that. the dialogue just cuts off there.
I found 14 keys in mainland that had weight, ranging from 1 to 0.01. Two of those are defunct keys from old m2 content that I've deleted, the rest got their weight set to 0 like all the other keys.
The Fighters Guild quest No Sin Unpunished has a part where the player is meant to be able to ask residents of Necrom, Refuge of St. Aralor about the topic Olmu Llendu to get a response beginning:
"Sister Olmu has vowed to follow Saint Aralor's example..." (the NPC goes on to explain precisely where Olmu will be at 4am so that the player can kill her without actually spilling blood in Necrom)
Balyn Ilvenes in Indal-ruhn has a unique Services line where he asks you if you want a ride, but he no longer provides fast travel (and neither does anyone else in town). Since removing that question made his unique line functionally identical to the generic one, I've deleted the whole line.