Overriding /etc/subversion/config with svn's builtins

If somebody uncomments an option in /etc/subversion/config, say
diff-cmd, to a program you don't like, say xxdiff, and you'd rather use
the svn's builtin diff and can't change /etc/subversion/config, there
doesn't appear to be a way to do this in your ~/.subversion/config. It
would be nice if you could say something like

[helpers]
diff-cmd = svn_builtin

and it would effectively unset the diff-cmd pointer.

Currently, the work around is to set it to /usr/bin/diff, but these
seems like a waste (although a small one).

Is something people would be interested in having implemented?

One question is, what would be a good name that you could use that would
"unset" the value?

Regards,
Blair

-- 
Blair Zajac, Ph.D.
<blair@orcaware.com>
Subversion and Orca training and consulting
http://www.orcaware.com/svn/
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