Parameter.as :
setDefaultKey("chickenSpawn", KeyCodes.UNSET);

MapUserInput:
  case Parameters.data_.chickenSpawn:
                this.gs_.gsc_.playerText("/spawn XP Gift A");
                break;

Options:
 this.addOptionAndPosition(new KeyMapper("chickenSpawn", "chicken Spawn", "Allows you to only spawn Chickens!"));