Ability to have individual permissions on Channels - particularly when a team has an External user in it
It would be great if you could restrict an 'external user (guest)' in a team from seeing certain channels or tabs? For example, you have a Team created for a specific project and you have external guests included. You don't want them to see a channel called Internal documents and so you could remove them from this channel only. That would mean the don't even see it. This is definitely a major requirement from us with Teams.