The flexibility to have one single source for the whole audit trail. Security is normally a function of what you know. If no access will ever be granted without our having a log of it, that is a great start. 

Together with this comes the Authentication and Authorization for almost any standard. Certification with digital signatures both for desktop and in your mobile. Other MFA using tokens and other soft tokens. And don't forget OATH, SAML and OpenID. We also provide HTML 5 support with SSO for RDP, Telnet SSH, for example. This is on top of our reverse proxy with SSO.