add_to_ for existing objects

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Two of my classes has_many of each other through a jump table. The 
relationships are declared and work fine via Class::DBI.

But I am unable to figure out how to associate an existing object in one 
class with an existing object in the other class using anything but a 
manual create. add_to_ only 
associates an existing object and a new object, not two existing 
objects with one another.

My relationship looks like:

Dashboard::Note->has_many( users => [ 'Dashboard::Note::User' => 
'user_id' ] );

Dashboard::Note::User-->has_a( note_id => 'Dashboard::Note' );
Dashboard::Note::User->has_a( user_id => 'Dashboard::User' );

Dashboard::User->has_many(  notes => [ 'Dashboard::Note::User' => 
'note_id' ] );

A user might decide to share one of his notes with another user. In this 
case, I need to associate two existing objects.

I guess I can just do a Dashboard::Note::User->create({
note_id => $note->id,
user_id => $user->id
});

... which isn't really all that hard at all, but was wondering if there 
was another way. I saw this 
issue raised in

http://groups.kasei.com/mail/arc/cdbi-talk/2004-09/msg00070.html

and it sounds like what I am asking for is not available but the ultimate 
answer ( http://groups.kasei.com/mail/arc/cdbi-talk/2004-09/msg00078.html 
) left me unsure.

Would a patch to add_to_ be welcome, to allow it to distinguish between 
existing objects and hashrefs for new objects?

Cheers
RT