In correspondence to my findings in the thread HybridAuthProvider and LDAP thread, I have programmed a simple HybridUserProvider that takes multiple UserProviders to pull its data from. It’‘s been successfully tested with our group’'s dual Default + LDAP/Active Directory infrastructure and may be a useful addition to the wildfire codebase.
Description and download of the HybridUserProvider is available at my web page https://www.tk.informatik.tu-darmstadt.de/Mitarbeiter/andreas#HybridUserProvider.