Now, to your argument, Morocco has seen some love in the 50+ Civ Civilization V thread, but it still falls under a lot of other African powers, such as Zululand, Ethiopia, Kongo, and Carthage. Although it has a strong history with the Barbary Corsairs and was a significant part of the Muslim conquest of Iberia, outside of the Mediterranean, though, they did not exert a great deal of influence on the rest of the world. Unfortunately, this tends to be the case with many of the potential African Civilizations, though many compensate for that in a variety of ways. That said, I would still rather see a nation like Ethiopia come next to represent Africa, or potentially Carthage, but that's just African nations; there are still other nations in the world that deserve inclusion (not the least of which being the Netherlands or the Maya).
In terms of powers, I'm aware that Morocco was quite the scientific nation, so obviously science bonuses are in order for a UA. I had a look at the 50+ Civ thread, and noticed that they had Black guards listed as a UU. They are a bit weaker than normal but can move after attacking, are cheaper to build, and workers can be "upgraded" into the Black Guards. I'd suggest giving a good read through of that thread. Never know what you might find or be able to contribute.