Thats wrong in NWN 1 you could have only one Char. in the vanialla game. In NWN 2 only four.
Yes NwN1 was not a party-based game. But for NwN2, even with the four size, you could very easily go into the game files and change that to whatever number you wanted. Didn't even need someone to make a mod for it. And the game ran just fine. I usually changed it to allow as much as eight companions sometimes. And then the last expansion for the game bumped party size up to six anyway.