Two suggestions to add some thematically appropriate flavor to the world (at least in my opinion).
1. Allow torches to be enchantable with the lore skill. Right now you can only re-enchant them with light. The idea is, it's a reading light for searching through bookcases or examining items. Plus most people completely ignore torches. Picture people putting away their shields or two handed weapons to pull out a torch to help them search through the bookshelves in the library. It just seems to fit, even if it's only a +1 Lore enchantment (but higher would be better).
2. Give the Drowned Undead stream the sailing skill. Higher UCL, higher skill. It doesn't make sense to me to see a bunch of pirate hat wearing undead running around with -4 sailing, while vampire lords at least have a 2. Plus, the idea of having PC ships crewed by pirate undead sounds cool to me. There's already ghost ship encounters with derelict ships full of undead. Let us get in on the fun too! Picture a fathomless depth pacted warlock or a priest of Umberlee sailing a ship crewed by 3 drowned. It just fits. [Edit per comment below] -Yes, but since summons can open doors and stuff, why not change that. Most have a near zero or negative sail score anyway, so only summoning pirate drowned would be beneficial.
Thanks for your consideration, one way or another.