I know this wont be read by taleworlds but co-op campaign could be done by having the game stuck at a constant pace. battles one player has with the AI can use the same system as when ai fights ai while if the other player joins the battle half way through they can arrive as a reinforcement. because of this the game speed would have to be running non stop but you can keep camps and resting at cities benifitial by making it rapidly increase healing. if this is possible then multiplayer campaigns are available meaning players can vs other players in industry, lords, holdings, power, crime syndicates and wealth making for a competative game. of course the players would have to deal with the constant time speed making traveling harder however this gives more merit to perks like pathfinder