Subversion and Client Authentication over HTTPS

Since I can't find an answer anywhere, how do you go about configuring IDEA 6 to connect to a Subversion repository over HTTPS with client authentication enabled? I just can't seem to find anywhere in the configuration to specify the location of the client certificate (which I'm hoping isn't because it's not supported...)

I see that TeamCity 1.1 supports this configuration, so I'm assuming it's in IDEA!