Of the two items in this request, #1 is complete and available.
- is still in the works.
This is part of the convergence roadmap – https://skypeandteams.blob.core.windows.net/artefacts/Skype%20for%20Business%20to%20Teams%20Capabilities%20Roadmap.pdf
As more details become available for item #2 I will share them with you.
Can one have a call with a person who is or is not on a team? I can see how one can have a call from the team site, but not in Chat.