Mac OS X Keychain integration as substitute for ssl-client-cert-file for client cert auth supported by Subversion?

Hello,

It is documented in Subversion 1.4 that "On OS X, the svn client now
caches passwords in Keychain, rather than in ~/.subversion/auth/".
While this is very cool, I was curious to know whether Subversion uses
or is able to use the Keychain to search for client certificates for
client authentication. Currently, I have to specify a path to a .p12
file in my ~/.subversion/servers. This is redundant, as I also have
that certificate in my Keychain.

Does Subversion have this capability? If not, I will file a feature
request. Thought I would check on the mailing list first, though.

Thanks for any help,
Smith