You can enable strong authentication by using other methods such as x509 or NESCM to increase the security than using the form based method. You can also use multi-factor for more security.
For more information, see Configuring Advanced Local Authentication Procedures
in the NetIQ Access Manager 3.2 SP3 Identity Server Guide and http://www.novell.com/communities/node/8727/integrating-novell-access-manager-actividentity-4tress-aaa-server-66.
For more information about extending the authentication mechanisms, see Identity Server Authentication API in the NetIQ Access Manager 3.2 Developer Kit.