Prior to the Summer ’15 release, if a System Admin wanted to get ‘log in as any user’ turned on permanently, one had to create a Case with salesforce and request it. But with the Summer ’15 release , we are getting  the “Administrators Can Log In As Any User” setting available to all Salesforce orgs. Administrators will no longer need to open a case with Customer Support to make this setting available.

Any administrator with the “Manage Users” permission will be able to control the setting directly from their org. Note: The setting will be set to “OFF” by default; administrators will still need to enable it. When this setting is enabled, administrators can log in as any user in their organization without asking end-users to grant login access.

This is a great tool for System Admins!!