Hi Scott,
Some days ago I have tested the authentication plugin of ATS in forward mode 
with Apache and postgreSQL so I suppose it can work with ldap or anything else 
too, on my experience it works but soon takes off available connections on db,  
adding a middle layer with lua and memcache to store authenticated users and 
ban the failed ones for n consecutives retries should be a solution to avoid 
resource expensive lookups over database (or other auth mechianism).
I hope that helps.

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