Using Multiple Secure Token Issuers

Hi,

 Sitefinity allows us to setup multiple Secure Token Issuers in the Security section, but how do we use multiple issuers at once, has anyone done that?

I'm using IdentityServer and a custom MembershipProvider to access users that are stored in Dynamics CRM, i'm using SitefinityStsWebApp in between the 2 in order to translate the IdentityServer  token to SWT. This all works fine and I can login to Sitefinity.

However, I still want to use the internal STS and user store for authors/editors, does anyone know if this is possible?