Swami, in order to accomplish no user authentication required and go straight trough the tunnel at least I know there is one method and Im sure there may be other methods Im not familiar with yet, you can configure your asa firewall tunnel group Ipsec Ike authentication parameters to not requiering user authentication but still authenticate through the tunnel group, while you can save in vpn client the tunnel group name and pre-share key password the no user name autentication will not be enforced.

Connect to your firewall command line and explore your isakmp user authentication for your particular RA tunnel name.

Example:

tunnel-group ipsec-attributes

isakmp ikev1-user-authentication xauth <--remove

replace with

isakmp ikev1-user-authentication none

This can be easily edited to enable user authentication again by simply revsering the script above, also this only applies to a RA specific tunnel group and not others in case you have other RA tunnel groups.

I believe but not sure as I need to explorer other obtions you may accomplish to save user name and authentication through certificate profiles provided by the firewall administrator to be imported into the vpn client, but again I am not to sure and cannot provide fruther comment on other methods.

HTH

Rgds

Jorge