See Identity Server , which is an STS that uses SQL Server for authentication. You can easily combine this with ADFS.
From the fact that I remember reading the license agreement for the release of CTP, it is just for comment - you cannot use it, for example. in a production environment.
According to @Eugenio, WIF only supports WS-Federation.
How did you intend to "stick with SAML 1.1"?
Update:. I suggest you use Identity Server for database authentication. Your WIF applications are linked using FedUtil to Identity Server. Then you combine Identity Server with ADFS. Your external parties use SAML to communicate with ADFS, and ADFS will handle the plumbing so that they can authenticate using the Identity Server database.
Please note that WIF does not support SAML at all.
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