Different URL's for different login groups (SAML 2.0)

Hi,

We configured SAML 2.0 in SAP NetWeaver Portal 7.31 SP03 for Single Sign-on.

1. Once user enter "https://...../irj/portal", the SAML will login the user into the portal automatically with out login page, this is for all end users.
2. We also configured the URL "https://...../nwa" to display login page for Portal Administrators who uses "Administrator" User to login into the system.

We have a different user group, executive assistants, who want to login manually, and they cannot use "https://..../nwa" since it's administrator desktop. We created a different URL Alias "https://...../irj/portal/eas", but SAML is kicking when ever it finds "irj/portal" in the URL and logging in automatically.

Is there anyway to configure a different URL in portal so that SAML won't kicks in and displays the login page? Please advise.

Thanks

Vijay