We should have a setting that only superlibrarians can set to hide patron accounts that regular staff should not need to alter. Test accounts, anonymous patron accounts, etc. Superlibrarians would be the only users that could alter accounts marked as such. You should not be able to mark superlibrarian accounts as hidden. Regular staff would be able to see names and card info throughout the system, but they would not be able to view the patron record. They should be shown a screen like "Admin use only."
That's certainly an interesting idea. I could see this being part of bug 26170 but it could be a useful feature in its own right.