Hi been testing out your plugin and I found an issue and I would also like to make a request.
The first issue is if you add an actor with no battle to a party that isn't full it will be automatically added to the formation. This is an issue for me as My party will have a total size of six and will not be full until many such characters have joined. Regardless of that flag. Now it's hardly game breaking as once that character is removed from the formation it disappears. And can only be seen in the main menu's party list.
Another really nice option would be to be able to flag the character as a guest. And have it be in it's own menu. Or at the very least hide it's level and stats to make it clear to the player that this character does NOT participate in the usual combat system.
Just my little requests