I didnt have time to go through all the ideas mentioned but i certainly agree on 8. Better signup system and 6. Time released posts.
And somehow i always like my own page skin. So if there is a skin to choose from / buy, or that it is possible to built your own skin and sell this for Steem on the Steem Shop ;), that would be great. And maybe learn a bit of Medium as in the User Interface. But furthermore SteemUp for this platform.