I agree on removing the wild animals. I also like the Maghreb changes, maybe some more fish in the Agadir area? Also what about a source of elephant in that area? Elephants in that are of Africa were hunted to extinction in the timeframe of the mod but there was once an ivory trade there.
I meant to ask if it was possible to code region specific UUs? Like if England conquered Scotland and then could build a special highlander unit (But only in cities in the Scotland
region)? They would basically be like extra UUs for each civ but with a few differences. There would be a limit on how many you could build (like missionary limit) in order to avoid ignoring the original unit that it replaces. My intention is to see, say, a united Great Britain field a stack of 10 line infantry and 2 Highlanders. The highlanders would have a rough terrain combat bonus or something, making them slightly superior to ordinary line infantry, but only a few can built.
More examples:
France comes into possession of Switzerland, now France can recruit swiss pikemen (They made up the bulk of their army up until the 17th century). Or maybe a single Swiss Guard unit, that receives an enormous bonus for city defense?
http://en.wikipedia.org/wiki/Swiss_pikemen
Spain comes into possession of Wallonia (Southern Belgium, or anywhere in Belgium for the purposes of this mod). Now Spain can raise Walloon infantry in Brussels.
http://en.wikipedia.org/wiki/Walloon_Guards
Austria comes into possession of Hungary. Now Austria can train Hungarian Huszars or tall, slightly stronger Hungarian Grenadiers.
http://en.wikipedia.org/wiki/Hungarian_Hussar#The_hussars_of_medieval_Hungary
Ottomans get a new default UU, the Sipahi, replacing the knight or armored lancer. The Ottomans will still have the Janissary as a unique unit, but they must be recruited from conquered Christian populations in the Balkans as in real life, not from Anatolia.

Or the Sipahis could be scratched, Janissaries reincorporated, and Mameluke calvary units made available in Egypt? Or Sipahis, Janissaries, AND Mamelukes?
http://en.wikipedia.org/wiki/Sipahi
http://en.wikipedia.org/wiki/Janissary
Russia will undergo a similar change, the Streltsy replacing the musketman, and Cossacks needing to be recruited from the territory of Kievan Rus.
http://en.wikipedia.org/wiki/Cossack
http://en.wikipedia.org/wiki/Streltsy
Those are just a few of the arrangements that could be possible. If this could be coded and enough people support the idea, I'm sure there are enough history buffs sitting in the countries I haven't mentioned with examples that would suit other civs.
