quick circuit tear down question

[Jon McLachlan]

Hey all,

  Maybe more for developers... but, does anyone know a way to tear down 
only the last relay on an already constructed anonymous Tor circuit, in 
such a way that the circuit remains unchanged except for the 
disappearance of the last hop?  It doesn't seem like this is 
documented/viable in the ControlPort given the spec @ 
http://www.torproject.org/svn/trunk/doc/spec/control-spec.txt, but maybe 
someone knows of a neat or hackish trick?  :)  Or maybe future releases 
of Tor might...

Best Regards,
~Jon