Hi,
maybe you know that for Morrowind there is a project called "Less Generic NPC Project" where they plan to change and beef up all dialogues in game.
Some weeks ago It was released a mod similar, on smaller scale, for the module "Ultima IV Reborn" made by Devi back
in the 2003 of Neverwinter Nights 1.
The language of this modification is only italian, but you can freely modify, translate and re distribute it.
I don't know if I can put a direct link or It's spam, but if you search the web for "Ultima IV Reborn AeT" or "Ultima IV Reborn versione AeT" you should find more details.
Thanks