can you use an external SSH client in SVNKit

I understand SVNKit uses an internal ssh client but i was wondering if one can specify (through property file for instance) an external ssh client?

This would be very useful in my situation because at my company our ssh client authenticates with the svn server using kerberos rather than private keys.

If this is not possible out of the box, how much of an effort it would be to patch SVNkit library to do this?