From Rogo 7.2.0 Admins will be able to select roles that are assigned to a user individually but only certain combinations will be valid:
Roles may be selected from any combination of groupings:
In the Staff grouping roles may only be used together if they are in the same group
Staff, Admin, SysAdmin, Standards Setter
In the Student grouping only a single role may be selected.
In the System grouping only a single role may be selected (You should not assign this to normal users)