Flaps and slots are standard STOL equipment, but but has anyone looked into the elevator/stab modifications on STOL planes?

On the Feiseler Storch, the elevator has a flat slat on the bottom of the stab, at the elevator hinge line and attached to the elevator and parallel to the elevator. Evidently, this "slat" keeps the airflow from detaching from the elevator during heavy elevator deflections and "stalling" the stab.

Similarly, on the PZL Wilga 35, the aerodynamic counterbalances of theelevator are fitted with what look like inverted slats on the LE, again to keep the stab from stalling at extreme elevator deflections. I'm sure that other examples can be found.

I winder if there is any need to apply this principle to our STOL models (except for scale consideratons)?
--Bill