From what I know, Morocco actually considers itself as a Mediterranean island who was temporarily attached to Africa and refuse to be called Arabs(the same way the English prefer to think they are an island in the middle of the ocean rather then as europeans). They consider themselves as arabized Berbers. Anyway, I would be so happy if they are included. They have all the characteristic of the leading civs (they had a big impact on the world, were more then once really powerful, were a cultural-powerhouse and made some important scientific developments).They could be in the 18 original civs. The only reason they weren't added earlier was because they were merged with Arabia. I would like a leader such as Yusuf ibn Tashfin, Ahmad al-Mansur, Abu Yusuf Yaqub al-Mansur or Abd al-Mu'min. (Except for the last one, they all have cool beard ) For the unique unit, it has to be the Black Guard(who would replace the musketman). An additional unit could be a corsair. As for the unique ability, the Barbary Coast bonus should probably be theirs.