The anticlockwise wind shift, while I enjoy it, and understand his purpose, it's constant regularity is anti-immersive.
Would it be possible to have local winds? each zone with particular wind shifts, perhaps determined by game time (example, at the afternoon, near the coast, winds tend to shift due to temperature differential), if time compression is not an issue.
Adding constant winds determined by season in some areas of the map would be cool too, this could become an interesting challenge for nations at war.
Having some constant winds, in specific areas, that last a few in-game months, could make trade and war more realistic, challenging, and fun. Add Meteorological reports to buy in-game and suddenly you have a new game mechanic.