Hi,
You can privileged user by multiple way:
If you want privileged all your imported user:
Make users created from LDAP Privileged
Set( $UserAutocreateDefaultsOnLogin, { Privileged => 1 } );
If you want privileged only some users, you will have to be a little creative and play with CLI or API:
Personnaly I import and update users group from LDAP.
https://docs.bestpractical.com/rt/5.0.4/RT/LDAPImport.html
Then i use a shell script from make a request with ldaputils utility on my LDAPs groups. Then i loop for each user i call the API to give him privileged right.
A cron task did the job everynight.
Now i only have to add user in my ldap group to see them appear in RT with the good rights.
Kind regards,