Other than the built in roles for Approvers, there appears to be a list of requester names available to select.
Requesters appear in the list based on whether they have the following option checked in their record:
I have 2 questions regarding this:
1) Can this option be ticked en masse for a set of users (either by script or a CSV file?)
2) Is there any way to get this option ticked by default when ServiceDesk imports a new user from Active Directory?