Something that I feel could have great roleplaying potential would be to add the ability for our characters to write books, diaries, messages in game. For example "King X sends a letter of condemnation to High Chief Y " or "Lars Bookworm wrote the Great Alchemical Guide in year 1035" etc etc
Of course only characters with high quality intellect could write such books
I dont really know if this is doable with this game engine, or how hard could it be. Or even, if it is already planned. But I think, roleplay-wise it would be great!