I had an idea; since we(or you, or other modders) probably wont have the resources to hire a boatload of Voice-actors, is to use the "zelda" way of voiced dialog:
In the Zelda games, every NPC only has one or two spoken lines usually in the form of "hello" or some other type of exclaimation.
The bulk of the text is not translated into voice-acting, resulting in long winded speeches and "intricate" dialogs without having to have the aforementioned boatload of voiceacting.
I think this could be used for a dialog-un-retardation-mod to great effect!
Suggestions/Feedback?