According to the 4.0 User's Guide it does: http://docs.oracle.com/cd/E39885_01/appdev.40/e38414/dialogs.htm#RPTUG41648
I am not too familiar with svn+ssh, though, and had no luck trying to test it against it my favorite SVN repository on a linux server. I also tried svn+ssh access to that server from a Windows command line using an SVN client, as well as PuTTY access, but that server's security policies seem to only allow me access via https. Maybe someone else with actual subject experience will jump in with a better response.
SQL Developer Team