We have run into problems where the wrong people receive notifications to certain folders. I would prefer if users (Standard or Power) could subscribe to individual folders, rather than only receive notifications for all folders they have access to.
In our company, we have a mix of clients, intra-company standard users, and power users. We give company members access to all of our general shared/file transfer folders, regardless of which clients have access to them. As a result, we all get notifications for ALL client file transfers. This generates a ton of email.
I would also like to be able to, as an admin, set notifications to default to OFF, but let users turn them on if they want to.