Sound Dims when NPC Talks

I don't mind ducking when it's in favour of optional stuff/places where I can make sure the character is safe. E.g clicking on lore items. Being able to disable incidental character speech would be cool, too, but, as far as I'm concerned, isn't the main issue as such. I really just don't want battle sounds/audio clues drowned out by way less important and mostly redundant stuff. :-)