With the Site Administrative privileges, you can generate a master password and use it along with any user name registered with the TeamForge.
You can create an authentication profile for master password users in Auth Manager. Impersonation is not supported in TeamForge but the master password feature facilitates any user in TeamForge, irrespective of the roles, to login as another user if they have a valid master password.
The Site Admin needs to generate the password through scripts and configure the authentication user profile using Auth Manager. It is important to have this configured for a web-based SSO system.