You should also be the first platform that provide login for multi-sig acccounts. For example, if my account dogs had posting permission for the accounts cats, it would be awesome if I could login to cats with the posting key for dogs. There actually isn't really much to it, and it's frustrating that nobody has done it yet. A user can sign votes, votes and posts with this pattern, I've done it in piston and steem_cli, so why not enable login to allow multi-sig signing of posting transactions? I realize it's a rabbit hole when you account for thresholds.