On the topic of languages: I agree it would be really cool, but I believe they've already discussed this: they wanted to include it, but was a bit too much with all the things already in the game (iirc). I think it was the Dropped Frames interview? Perhaps some low-impact simple things for flavour (as with your example of reading some environment writing) would be ok, but I can see players being confused about/displeased with languages being seeminly useless and not mattering.
Will have to go look up the drop frames interview and check it out. I mostly suggested because in one of the trees with Astarion you have an option to mention that you are Baldurian, so from there I thought some kind of these are what I know would be nice. Totally understand that adds a whole lot of extra planning on top of everything though.
