The slack invite system works this way, actually, for multiple invites, and is quite nice.

This is probably most easily achieved by having a large text box where you can supply comma separated emails. You would then parse this list to extract emails and send invites, leaving badly formatted emails behind. My team built this for an invitation system in a management portal. We also accepted emails directly copied from email tools like Outlook and Gmail, ie:

"Fred R. Smith" <fred@example.com>, Sarah Exampleson <sarah.ex@another.example.com>, tom.thirdemail@example.com

...so it's easy to populate the field with a bunch of emails. Thanks.

It would be great to be able to create member groups that could be bulk added as well.

Totally necessary

"This would be incredibly helpful. It is currently very painful to be managing this for 20 different workspaces with 20 users = 400 assignments."

It would be really great if there were group-based permissions! Right now it's quite painful to onboard a new contractor to our team as I have to manually add them to dozens of boards.

If I could add a group to a board and then manage permissions based on group that would be great! This would dovetail nicely with the ability to group boards together into folders. Would be helpful for us to sort folders on a per-client basis.

Related: http://storiesonboard.uservoice.com/forums/276721-general/suggestions/9305997-have-workspace-permissions-extend-to-it-s-storymap

Display user data as a grid so I can see more per page
Allow filtering by user type, permission so I can control my subscription usage more easily

The Manage People page needs to give you the ability to view a larger number of users on the page without paginating. At the moment you only see 7 per page. I'd suggest making the tiles a lot smaller so you can see more on a page.

You should also be able to group by user type i.e. group by members, admins or observers.

You should also be able to add users to storymaps from the Manage People page rather that having to add users individually from the map itself.

We've just imported a load of maps from 3 different trial versions we were using to evaluate the product. We've now bought the product and have imported the various maps into the new corporate workspace. I've spent half a day so far adding everyone manually to their relevant board so something that allows you to specify which boards a user can access from a single space would be great.

Also,the process of inviting a user to a board seems a bit flaky. If I invite them to our workspace and then add them to a number of boards, they can't see the boards unless they click the link in each email that is set to them. May be a bug but it seems to be too convoluted - they should click the link to get access to the workspace but each board should be available regardless once they've been added by an admin

Simple ability to export the list of active and invited people to a workspace.