If you know how to disguise ur mod as a DLC using MPMPM, it's just commenting out a couple lines in the DLL that goes
Code:if (!bIsMultiplayer) { ... initiate dialogue }
isNetworkMultiplayerGame()
I wouldn't play MP with AI's. They are really dumb and very easy to exploit, steal from and kill. No human is going to give you 10 gold per turn for a luxury or let you pillage all of their tiles and then make peace or give you 2000 gold for a peace deal or let you steal their workers and then make peace or not make units while in the middle of a war etc...
Well, that's what their vast bonuses are all about - making up for their dumbness.
Of course, if you have seven or so MP buddies who are all good sports and take their turns quickly then I could see not needing the AI. Of course, the minute anyone quits you're playing with an AI, aren't you?
Yes, when some one leaves you are playing with an AI but I would never start a game with the intention of having an AI. I would rather play 3FFA than 4 - 6 with 3 humans only.