Sorry mjfrederick, it must have been the other way around. Even the prototypes have the elevator slat (see [link=http://www.youtube.com/watch?v=VDcB0pSUYOI]here[/link]). The drawing linked in post #9 shows the cambered cross section of the slats quite well (just enlarge the side view), and the Italian comment next to the bottom view says "omitted in the last versions". Information is scarce but says just that and that the first prototype had both too little elevator effect and too much elevator stick force. Don't know if they later modified the whole stab.

I agree that the Storch is overengineered compared to American types, but these linkages were quite common in German aircraft. Again, there have been built not that much Storks, only for special tasks. There were other, simpler or faster liason aircraft.