Support for multiple AD/LDAP domains coming?

Will FAC ever support being a member of multiple LDAP/AD domains? I was a bit surprised to find out that it cannot be. I understand that in normal situations a machine cannot be a member of multiple domains, but I figured NAC would be able to.

We have a few different internal domains, with large numbers of users, and not being able to do automatic grouping against LDAP OU/CN membership is a pretty big burden.