short user names with ssl client certs?

Hi,

I'd like to use apache with ssl and client certificates for
authentication. Unfortunalty I created the certificates so
far with my full name in CN and my email address in E=.

Can I somehow map the long string (provided by FakeBasicAuth)
to something short that will show up in the svn log?

for example map "/CN=Andreas
Jellinghaus/emailAddress=aj@dungeon.inka.de" to "aj" ?

thanks, Andreas

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