a fall

I thought glisses were working in the current rev. if they are, maybe he could fake it with one. or if not, he could add some quick downward notes after the note with the fall, add a slur, make the little notes invisible and scrunch it up with "add less stretch" until the slur goes down at the right angle.
None of this is really a true fall, though. As David said, it's not supported yet. Another job for those MIDI controllers......