Sylvia Amito'elau asked about creating a user role for support admins that might be working help tickets which would allow them to masquerade as a student but not a teacher. Unfortunately, this is not currently an option in Canvas. However, you could create a role that had the "Become other users" permission enabled while disabling other permissions such as the option to "Manage (add/edit/delete) courses", etc. See the How do I set permissions for an account-level role? guide for some instruction on roles in Canvas.