If you need ideas for scenarios here are a couple:
-Mesoamerica: I liked Civ3's Mesoamerica scenario, even though it was very basic. I have heard the one included with Beyond the Sword is lackluster as well. I'd be curious to see what the Total Realism team could do with such a scenario. What I imagine would be you would play as several different civilizations/kingdoms in ancient mexico, such as the Zapotecs, Huastecs, Totanacs and Mayans. In addition this scenerio could feature the rise and fall of the great Mexican empires. At the beginning of the game the greatest power would be Teohuacan, which would have influence extending to the Mayan territories. Eventually this empire would be hit by an event which greatly increases unrest, and unless great steps are taken(if the player is controlling the empire), the empire will fall. In short time a new power will rise in the form of the Toltecs, who will aggressively expand and conquer shortly after they emerge. Later on another event will be triggered, and a massive wave of immigrants from the north will settle in and nearby Toltec territory. As before unless this situation is handled with great care the Toltec Empire will collapse, and there would be another period where no empire controls the heart of Mexico until one of the tribes which settled from the North builds a capital nearby the old fallen Toltec capital, forming the beginnings of the Aztec Empire.
Finally, at the very end of this scenario, an event would be triggered, and small pox would break out threw out Mesoamerica. Afew years after this horrible event the Spanish would arrive(lead by Cortez) and quickly ally themselves with most of the tribes which oppose the Aztecs.
-American expansion: Basically the United States in the early 17th century. This scenario would allow you to play as America and conquer the natives with either treachery or military power, or for an interesting twist you could play as one of a number of major Native American powers, such as the Iroquois, the Lakota or the Cherokee, and build your own empire to survive the onslaught of the white man.
-Russian Revolution: Play as Czarist Russia as you attempt to hold onto power amid the growing power of the Communist Revolutionaries, or play as the Bolsheviks and successfully take over Russia, creating the Soviet Union. Another possible faction would be the democratic revolutionaries, who aim to defeat the Bolsheviks and establish a Democratic Russia.
-The Ancient Near East: Play as the Ancient Egyptians, Babylonians, Israel, Assyria, the Hittites or Nubians as you battle rivals, build monuments and increase your territory. Just as with history, new powers would rise later in the game, such as the Sea People or the Persians. In some cases these new powers would supplant or destroy empires(Sea People destroyed the Hittites, while the coming of the Persians effectively ended the Assyrian Empire). Since alternate history is possible, perhaps if the Assyrians for example, could have fended the Persian immigrants long enough, they could absorb the newcomers into their empire. There would be exclusive religions in this scenerio, such as Kemetism or "Mesopatamism"(religion of ancient Babylon as well as Assyria).
I hope these ideas help.
On another note its great the new version is out and ready for Christmas! I look forward to trying it out. Thankyou for continuing to create this great mod.