For the sake of historical accuracy, I request these improvements:
1)There should be two separate borders.
The cultural border and diplomatic border. In reality, culture really does not affect policy so much as we seen in world history, Japanese had never been succumbed to Chinese rule despite the heavy influences of Chinese culture onto Japanese Culture. My concept is that, the cultural border retained the properties of the previous CIV series. While the diplomatic border is the actual functional border of a civilization. At first, a diplomatic border has no difference with cultural border; but when a civilization developed writing tech, the civilization can alter her diplomatic border by diplomatic agreement, or by certain military effords. It is not complicated, for example, a city may has 5 unit of distance of cultural border but 6 units of distance of diplomatic border, while a civilization also can claim a tile of territory of economical importance by waging war or by signing treaty with the original owner of that tile. A city's citizen could only work on the terrain within the diplomatic border, not the cultural border.
However, the diplomatic border would grow alongside with the cultural border, if there is no military intervention and there is also no other countries close to one's civilization.
2)civic should affect the way game played:
Civic should not merely altered the variables of the game mechanics such as the grow rate of Great people or the finance so on, it should change the whole mechanics of the way the game played. For example, if a player choose Feudalism as one of his civic, as a result, the player couldn't micromanage his cities, i.e. he can not assign the tiles to his citizens but it is done by the governor of the city alone. Besides, by choosing feudalism a player has option to assign a city(or more) to one of his Great Person as knight, the GP will rule autonomous on the cities and will has his own army; The autonomous Cities will enjoyed lesser maintenance, but the GP has to pay tax to Player and should send his army to assist player during wartime.
3)More personalities to the Great People
This is not my original idea, but the concept adopted from most Japanese Tactic Games. Great People could play a greater role in the Game, a general should command a band of army instead of only one unit, not all scientist will do the same but each has their own unique ability, for example if two scientist is assigned to a city as specialists, while remaining the basic attribute(adding research point), one can also boost the spread of religions(maybe he is as religious as Newton and Pascal), the other can fastened the rate of research of military technology(Archimedes!). But all GP will has their own life-span, maybe a 20 turns to 40 turns. And they all have an attribute called loyalty, a GP with low loyalty could easily betray player by serving other nation, while in Feudalism, GP with low loyalty could possibly declare independence and break from player's control.
, one which gives all cities + 1 
, one which gives all your units +5% strength, one which decreases the chance of your planes and nukes getting intercepted and increases your chances of intercepting enemy planes and nukes. These four future techs could be repeated like the singular future tech we have now.
