There should be special servers that change theme every week to break the monotonous trends of of Battle and Siege.
Every week the servers genre can be a new theme Medieval (Hundred Years War, Italian Warring States), Asian, Roman, Eastern.. Rules can exist to say what type of armor and weapons one is allowed to use.. For instance teams would be wearing the opposing respective equipment:
Medieval (England vs France): Western Armor.
Medieval (Italian Warring States): South European Armor, Papal clothing.
Asian: Samurai stuff.
Roman: Roman equipment (should be added) and barbarian equipment.
Eastern: Middle Eastern equipment
Crusades: Western Armor vs Eastern Armor.
Greek Wars (Spartans vs Persians): Naked hoplites vs eastern warriors.
Greek Wars (Spartans vs Athenians): Red hoplites vs blue hoplites.