you can do this in SharePoint today (i.e. put all members into Read Only permission bucket)Ben Patrick commented
Ability to have a Read Only/Comment only function for Yammer and Planner. I'd like to use Yammer as an online noticeboard for the company and use Planner as a holiday and events calendar. Problem is everyone can edit planner and post in Yammer. Want the ability to lock the Planner and the uploading documents/creating posts to a select few people (admins), then everyone else can only comment on posts if its a public group, or only members can if it's a private group
To change the email address of the group, follow the best answer here: https://answers.microsoft.com/en-us/msoffice/forum/msoffice_o365admin-mso_exchon-mso_o365b/how-to-add-an-email-alias-to-an-o365-group/79d94383-442a-4e3a-ac62-4ff1ea8af962.
We’re working on renaming the Team Site. Stay tuned.