Playing a LAN game, two of us made new characters. When we were at 4 with two NPCs added, I could move the NPCs, assign them either to the host or the player that joined.

The bug I found was Hosting a saved game with two PCs and 2 NPCs, and wanting to assign one of the NPCs to a third player. Loading a saved game, the lobby was at 1/2. After one player joined, the lobby told them it was a 2/2 game, and there was no room. We tried with one PC and one NPC added, with two free slots. In the lobby, that game was treated as a 1/1 game. At present, the lobby only works for PCs.

I can see my friends all wanting to play their own games, but on a Friday or something, doing a LAN, and loading up one of our current games, and having others play the NPCs. But at present, the lobby is not open. It would read as 1/1 instead of 1/4.