Hello Martin. No, in Moodle users have a role in a course but it's not a good idea for users to have a role in the whole Moodle site. For example a person can be a student in one course, for example History, and be a teacher in a different course, for example Geography. So it's not usually a good idea to have a role attached to a person because that person could have a different position in a different course.
Roles and permissions
Academic Role
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