In the Enrollment Flow - Enrollment Attributes, allow identifiers to be hidden and unmodifiable (same as role attributes)

When you edit enrollment attributes, any attribute that pertains to a 'role' gives you the option as to whether to make the attribute modifiable or hidden(See screenshot image_2)
Those options don't appear for any other type of attribute, but my use case needs it for COperson Identifiers(See screenshot image_1)