You see, the way that you think isn't the way that most people think (in reality or in games) - which means it won't be accepted very much. The same outlook is going to be taken by the factions in-game if you decide to go that route - and when everyone hates you, you won't last very long. If you take the AI frmo the Civilization games, they know how to exploit that - dog-piling on the faction in question. So even if you do manage to grind the 20 cycles to gain power (and you aren't picked off in the meantime, not taking into consideration SS's never-dying-main-character syndrome), you're probably going to be dog-piled by all the other factions and get your faction wiped out very quickly. It doesn't matter how good in combat you are - you can't be everywhere at once.
Besides, a lot of what you usually say has a lot of base on exploiting the AI (by usually taking advantage of what the AI can't do when compared to a human) - not really the best base for a game mechanic, I think.
@Thaago
I think the Sindrian Diktat was created by the Hegemony themselves - not really by a rouge person invading and making a faction by themselves. They had (and still have) the authority and power of the Hegemony behind them - think of the Sindrian Diktat as a satellite state of the Hegemony.
EDIT:
As a side note, did anyone notice that the Persian League, Ko Kombine, and even the Luddic Path are already in the the game? Maybe not as a faction, but you can find their descriptions and flags in the game.