Well, when you go to Administration -> Permissions -> Global Permissions there are some actions related to users like Manager Users, Manager Roles. By default only Administrators can execute those, but you can create a special role that has access to this but has only View permissions for other content like Pages, News, etc.
The default Workflow are based on Author/Approval conception, if this isn't what you need then you would need to use a Custom Workflow. However custom workflows are only allowed in Professional and Enterprise versions of Sitefinity.
the Telerik team
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