The sub-saharan area was an interesting time during World War II, and it's impact during the war is underestimated. Here are some other events or modifications and their possible effects.
I haven't started working on any of these events, but perhaps these could be debated for their overall value to the game experience and the good ones can be further developed. Let me know what you think.
-The railway between Djibouti and Addis Ababa was about as important as the Mombasa-Nairobi-Kampala Railway sytem. Infrastructure should be improved to represent that.
-For some reason, v1.05 has Ethiopia as a Left-Wing radical government, this should be changed to Paternal Autocrat.
-Italian army, having lost to the Ethiopian army at the Battle of Adwa in 1896, was absolutely determined not to lose the war with Ethiopia. I think the Italian invasion should be so overwhelming that they will win 99% of the time. Italians used tanks, heavy artillery, and most notably poision gas in Ethiopia, so the more heavy units should be placed in the ranks of Italy's army in 1936.
-The use of poison gas by the Italians should bring up another event. The use of gas didn't effect the strength of Ethiopia's army, but their organization would take a hit because the troops had to scatter. The larger effect is on the widespread use of the gas on civilians, fields, and water sources. Manpower and industrial capacity should be reduced to represent this use.
Also, the European reaction to the use of poison gas by the Italians should be represented. Historically, they let the issue pass without incident, but their was talk of harder sanctions on Ethiopia.
Outside of Ethiopia, there were some other events of note:
France-Vichy France:
-French West Africa was surrendered to the Free French by 1943. Perhaps the takeover of all VP's in North Africa by the allies could trigger this handover.
-The Free French had large numbers of Africans in their army, up to 60% of all troops in several divisions. Perhaps that could be reflected with adding some more African division names. I don't know where to find potential African division names, but it might be worth checking out.
-Camp de Thiaroye Massacre in 1944. The Free French killed thousands of their own troops during WW2 who rioted or demanded their independence. This was most notable in Algeria in 1945, but the French also killed hundreds of rioting Senegalese troops in a camp outside of Dakar.
-Burma Campaign of 1942. Many African units fought first in the Burma campaign. Perhaps an event will create a few new units in Burma in the event of a DoW between Britain and Japan.
-Independence movement, probably best shown by the establishment of the Kenya African Union in 1944. Increased civil unrest (perhaps 1%).
South Africa:
South Africa was debating whether or not to join the western alliance, remain neutral, or tacitly support the Axis cause in a way similar to the Spanish and Portuguese. I can't recall many of the events, but I could look over my books over the weekend and come up with some events strings for South Africa.
Sea zones:
German and Japanese submarines patrolled extensively around Africa. More Japanese submarine presence in the Indian Ocean provinces, and more German presence in the south Atlantic Ocean provinces.