I've got a suggestion for some multiplayer maps: Mordheim, with lots of densely packed buildings, rooftops connected by planks and poorly made ladders, and sewer tunnels connecting various broke sections of street. You could have game modes ranging from 'capture the wyrdstone' to sieges against ruined buildings. I'm not sure how open Warbands is to three team modes, but you could even have an escort mission as per Mordheim's 'Lost Prince' scenario.