Access rules (AuthzSVNAccessFile) without redundancy?

Greetings, All!

It is possible to have AuthzSVNAccessFile rules applied without redundant
bloating of that file?
I already have my users authenticated against given group in users registry

<IfModule sspi_auth_module>
    Allow from all

    AuthName "Subversion repository"
    AuthType SSPI
    SSPIAuth On
    SSPIAuthoritative On
    SSPIOfferBasic On
    SSPIOmitDomain On
    SSPIUsernameCase lower
    SSPIBasicPreferred On

    # only developers may access the repository
    Require group "DAEMON1\CVS"

    # And they should obey to SVN user permissions file
    <IfModule authz_svn_module>
        AuthzSVNAccessFile "C:/home/svn/.registry"
    </IfModule>
</IfModule>

But I need to make one user to have only read-only access, so i can use it
for exports... with relative safety.
It is possible to do without hooks, using only authorization/authentication
mechanisms?
I've tried

[/]
* = rw
svnprojects = r

But "* = rw" takes precedence over specific user rights :/

-- 
WBR,
 Andrey Repin (anrdaemon_at_freemail.ru) 07.04.2009, <19:52>
Sorry for my terrible english...
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