The power users want to have the ability to delegate Steem Power. There is some existing ways to do it. https://steemit.com/delegation/@timcliff/tutorial-how-to-delegate-sp-to-another-user-using-the-steemconnect-tool-from-busy-org

Also Some of the features that https://streemian.com/ offers. Being able to automate the rollout of posts. Also creating curation trails.

Just a few power user features to think about. If a lot of the cool functions of a lot the tools out there were put in one place with a couple of other features that really haven't been done then people would love it.