web2py definitely needs the auth tables to work with any auth backend (even 
LDAP).
Of course username and pwd are stored in AD, but AD doesn't have, e.g, the 
user id.
web2py uses auth_* tables for dealing with RBAC, and even if you don't need 
granular permissions, groups etc, it still has to map a user to a unique 
integer(ish) id.
Moreover, auth_* tables assure you that you won't continuously hit the auth 
backend once authenticated (sort of a "cached" copy of what is needed is 
written into the database).

You shouldn't have problems with firebird .... what is the exception your 
app raises when trying to create the auth tables ?

-- 
Resources:
- http://web2py.com
- http://web2py.com/book (Documentation)
- http://github.com/web2py/web2py (Source code)
- https://code.google.com/p/web2py/issues/list (Report Issues)
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