Your comments

Forum moderator functionality is key. Ability for someone to sticky and edit posts in 'their' forum.

It's a good point. Then it's maybe better for an admin to create @mention groups, or allow everyone to be able to click to see the members, or hover to see the members. Forcing users to create unique names, shouldn't be an issue.

Also, integrate into OS X notifications service (like slack) :)

I would like to see this too. For me, it would be great if you could define a group of people under your own profile, and then choose whether to make that group 'public' (ie available for others to use) or not. This is only for the purpose of group @mentions