Since TYPO3 administrators are this extension's target group, most users already have a backend-user account with an administrative permission.
Nevertheless, if you need to configure a backend-user with restricted permissions, just create a backend-usergroup and set the desired modules, tables, allowed exclude fields, page content plugins and anything else the backend-user should have access to. All corresponding fields to the caretaker are able to set/unset. This way, it is possible to setup backend-users who have access to the caretaker functions without being a TYPO3-admin.
Note: As usual, all permissions of the caretaker are unset until a TYPO3 administrator activates them.