Slitherine

To sum up, imho Greek cavalry don’t need being made less maneuvrable. It is not a matter of horsemanship. The FoG2A player just needs to choose (or make) a map with enough rough terrain, seashore and flanking hills to simulate the area of Greece (or any other mediterranean one) he wants to play in : the Thessalian plain, a mountainous region, etc. Then he will decide whether or not he wants to field cavalry. That's the historical way imho.