Well since this game is gonna be single player oriented. Can i just research an assasin and send him in the oppnents kingdom and kill him off, while the rest of my army gets wasted? I dont see why not i mean itll make this game so much faster and not much easer than what it sounds already.
As long as the assasin costs the same "effort" as the army that is wasting yours... Such a unit that can end the game faster than an army shouldn't be easy to get. And I still see that you want uber fast games. *points the bit of 'make this game so much faster'*
Anyway, I want the possibility of ending my enemies life using an assasin. But for balance reasons, if it were easier to finish the game using assasins than using anything else, it'd end with everybody researching the proper techs for assasins asap and use them to finish the game. But someone who doesn't invest in security and counter espionage deserves some nasty surprises from time to time... like natural death by a knife in the back.