Yeah, NWN2 should offer a lot more diversity in terms of area building.
In any case, yes, modding *can* be a chore, but it doesn't *have* to be. It really depends what you're focusing on and for what reason. I just like to go with the philosophy that if I don't enjoy modding it, then the player probably won't enjoy going through it. Of course, it doesn't always apply, either way, but it helps you keep on track of why exactly you're making a mod in the first place. Who are you making the mod for?