They game creator should add rebel mode. Like when you and others play a game and no one moves for a set number of turns(can be set) one or more lands(also setable) turn into AIs. This would add constant spice to the game.

Of course this mode should be optional with a large range of mobility

You can make a mod with such option.
Not really important enough to implement in base game IMO

Well, you can't ""add"" a AI or player to the game. But if the player/AI is already in the game, you could give them the territory. (@mods)

Given that OP don't have a Membership, I will just tell you to get hyped for unity. ;)
Already quite a few good mods out there.

Edited 10/8/2017 00:03:43