The team is working on the API, and we will post as we have more information.
In the meantime, for Embrava, please note they have announced presence support for TeamsOnly mode with their version 5.2.16.
Performance has been and continues to be a big focus area for Teams. One main area we have made improvements in is responsiveness for the most frequent user actions of switching between Chat, Channel, and Activity. We are also focused on reducing resource consumption and application load time. More improvements are on the way.
After careful review the feature team has declined this request.
However, they are working on a solution – creating a professional compact chat, you can follow and up-vote the topic at: http://microsoftteams.uservoice.com/forums/555103/suggestions/17408641
We’re currently working on defining a compact mode experience. I will post more details when we have more to share.
We acknowledge the customer demand for Private Channels and have been hard at work on it. Private Channels is currently in preview with a select group of customers. We expect to release the feature to the public later this Fall, and will update here when we are starting to roll out to all customers. We appreciate all the feedback you have provided to us on this forum and thank you for your patience.