Probably not. You have to remember that Neverwinter is D&D based. Most people who play D&D or Pathfinder and such are heavy role-players. They're used to creating back stories, custom scenarios, etc, because the game they play requires it.

While FF has a decent RP community, creating custom content is different, and I feel the addition of such a feature would largely go unused or would be full of half hearted creations