Indeed, the overhead text spam in Cyseal can be a little overwhelming. My issue was losing key text amongst all the cheesy puns... Get it? Sorry, anyway, you're referring to overhead text not voice overs. I'm fairly certain that fixing this issue would involve editing each individual NPC as the lines are probably using individual timer functions.
Another issue I noticed was that my chat bar was spammed with text from NPCs that weren't even nearby. However, I'm not sure if we can even edit Larian's scripts since they're all read-only. From my understanding, we can only make our own to add to the main module. But I could be mistaken, given that I work with custom mods. Maybe there's a way to unlock and modify them.
For now, I think there is a check box in the chat bar that lets you turn off shouts. But you'll still see them when you walk past the NPC.
