I agree with your statement on Great Ninja War and support the fact that an extra chat should be made to talk to your team who is on the current battlefield with you. As for arena, I don't think this feature should be made because only in servers that started late such as s110 the wait time for arena would be different than the wait time in s1 because s1 has more players so this feature wouldn't make a whole lot of sense. Also as for the Nine-Tails Invasion idea I also don't think it would make very much sense but I do agree that it is sometimes difficult to click the Nine-Tails and I do think that the Icons should be repositioned to somewhere less common for you to click while attacking Nine-Tails. Finally, for Team Sets being saved I do think this would save a lot more time for players having a preset of teams just like having a preset of skills/abilities ready.