Here's this was short easy one.
There is a thread in the JP side (Marc started) where people post ideas for traps, methods to clearing + new instance ideas and YoshiP likes it.

Original Thread Link: http://forum.square-enix.com/ffxiv/threads/15310

Started it's own thread with Marc's idea: http://forum.square-enix.com/ffxiv/threads/16026

Quote Originally Posted by Naoki_Yoshida View Post
プロデューサー/ディレクターの吉田です。
Producer/Director Yoshida Here.

めちゃ良スレ感謝です！
パッチ1.18のインスタンスレイドの企画と仕様には間に合いませんでしたが、
次回のインスタンスレイドのデザインの際に、参考にさせて頂きますね！＾＾
Thanks for the awesome thread!
Didn't make it to the 1.18 patch instance raid but for next instance raid design ideas, will definitely use your examples! ^^