I'm sure a lot of people would be on board with this, but I think it would go a long way for them to add in a feature where you could spectate battles in TW, or rewatch the aftermath. This would be a great learning tool to help tell guildies where they may have gone wrong in the fight.
At the very least i think we should be able to click on a team and see what teams had been used in previous attempts.
From an officer/leader perspective it would go a long way towards managing TW as well. You can see which members are picking terrible matchups and hurting the guild, or you could see if any members are just collecting easy banners and not attempting to take out higher quality teams. I think this addition is highly desired by a large portion of the community and would get utilized in some aspect.