Ok I'll ask the million dollar question. Aside from role playing a detective what is the benefit of FE? Sure you get to know who killed someone or opened something but does it give any other benefit? Ie does it boost another skill ie like inscription to magery or something? curious minds want to know?
It can tell you who is in thieves guild.
Not much use really...but if youre in Tram and they die for whatever reason you can loot em. Kinda fun to take uninsured items from them in Trammel. Or if in Fel you wont go grey looting a thief corpse.
EDIT: You dont need FE to do these things. Just makes it so youll know when you use the skill on someone.
And to the OP, see if your shard has any lockpicking houses around. I GMd by using lockpick boxes of the same skill level. When lockpicking you use certain boxes according to your skill level, FE seems to work exactly the same. If you have 70ish FE find the 70ish boxes,etc. Around 85 or so youll need GM locked tinker boxes.