I've dug through a lot of Larian's scripts while I was trying to learn how it all worked. They scripted really efficiently, which makes me think that this wouldn't be all that hard to change - the hard part would be FINDING the correct lines to modify.
All of the NPCs who speak are probably part of a Database, and the timers probably effect a bulk of NPCs. I can almost guarantee that each NPC won't have its own timer. I have enough going on with my own project to dig into this now, if I stumble upon it I'll post here, but if someone's wanting to look for it, I'm sure it's not that hard to change.
