Agreed. The multi select option is implemented quite confusingly right now.Arnd commented
Would be a great feature together with the "oops I did delete all my files - can I get them back - Function" :-)
We are working on this right now. We already changed the event concept to make it easier to create private and public events. As a next step we make it simple to invite whole workspaces or pages to an event.
We are planning this feature for a lot of content types.