I agree with the fact that there should be more room for WoE parties, but unless the parties amount of TaeKwons are limited, it would be abused. The easiest solution to your WoE problem is just to make a few parties, each with a different objective. One for defending one room in a castle, another for defending another room in a castle, and maybe one or two parties on offense, attacking other castles. However, it would be convenient to be able to make a larger party for WoE. How unfortunate...