We have folders that collaborate hundreds of users. We have occasion to need to modify their permissions. It would be very useful if there was a way to modify the permission level of multiple users. Using the Web UI to modify a single user at a time is very inefficient.

Either via selecting multiple users at a time, or even better, if you were to "re-invite" a user to a folder and select a different collaboration permission.

This way you could use the invite dialog box to re-invite 100 users - and change their permissions all at once.