Petty-Dwarves: I still see no good reason for the Feanorians to hunt Petty-Dwarves. It's completely out of character to do it for sport, and absurd that they wouldn't have been informed of Finrod's alliance with the Dwarves by the time Nargothrond is built. They do lack modern telecommunication, but that doesn't make all communication between kingdoms categorically impossible. We know Finrod visited the Feanorians multiple times, and that Maedhros visited his cousins multiple times (which we should show this season and next). Presumably Fingon did too.
Hildorien: the thread "
What ever happened in Hildorien?" works out what Morgoth and Sauron do there and when each is gone from Angband. Is there more we need to discuss about it?
Dagor Aglareb: I think Morgoth should start this battle, as Tolkien wrote. Not Gothmog.
Dwarf trading: Besides Caranthir, there also needs to be a connection between Dwarves and Curufin, given that he was
the expert on Khuzdul and his son befriended them. I think Aegnor and Finrod should interact with Dwarves mainly outside of Feanorian lands; there's no reason Dwarves would be unable to visit Dorthonion and we know they travelled in West Beleriand. I like Amysrevenge's suggestion that Dwarves are better than Noldor at
fast crafting. Maybe also mass-production (by hand, of course).
Eldalote: She has a Sindarin same Edhellos so it's very unlikely she stayed in Valinor, and I haven't seen any text saying she stayed. Actually we should call her by her Sindarin name, like most of the Noldor.
Finrod's mind-reading: (sourced from rereading the Osanwe-kenta, in the Vinyar Tengwar journal) Mind-reading only works if the other person
lets you. Most minds are "open" by default, but the moment someone closes their mind, the telepath is 100% locked out. There is no mind-reading by force. Elves and unfallen Ainur may suspect closed-minded people are hiding something, but of course can't prove it. Dwarves, in particular, see likely to close their minds out of habit around non-Dwarves, and if they do Finrod will have to just get used to it.
Closing your mind to telepathy doesn't work well while you're talking. While you say something, a good telepath can read what surface thoughts lie behind your words. This lets Finrod be a universal translator, and maybe even detect spoken lies.
Finrod might be unable to read the minds of Elves as easily as Men, but I doubt it. From what I'm reading, willingly talking automatically opens any mind to reading, although it isn't clear to me whether being forced to talk through torture opens the mind, or if spoken words can be assessed for truth or lies during torture. It seems not, or at least not easily. Elves can also talk to each other telepathically, as happens at the end of the RotK. Voluntary telepathy is extremely hard for Incarnates, though, and very few Elves (let alone Men or Dwarves) are likely to be
good at it. Finrod and Galadriel are very unusual (Finrod being more powerful than his sister).
None of this is a Detect Demons or Detect Evil power, though. Telepathy also isn't a passive ability that just happens. Somebody has to concentrate on it, and I'm sure it takes effort. Mind-reading is also two-way, so if Finrod reads Bobwe, B0bwe gets to read Finrod right back.
Minds are hard to read if they're distracted (by prayer to Eru, concentrating on something, or telepathy with somebody else)