I have an idea for a imagined expansion of CitOW: the addition of the beasts of Chaos.
By now, every God has his Greater Daemon and a warrior-type Daemon in the game.
My idea now would be to add the respective chaos beasts (ie Khorne: Bloodhounds, Nurgle: Slimebeasts, Tzeentch: Discs, Slaanesh: Seekers) to the game.
They could be simple 1 power units with Attack/Defense 1/1 (maybe 2/1 for Khorne, but with an increased cost), but with the power to move about the board.
Other units can only be summoned to and about the board, but the chaos beasts could have the option to move one map section as an player action.
Other small rules could be imagined to balance the beasts and the warriors of a given god.
Thus, the owning player (and the game in overall) would gain the possibility to react better to enemies without having to summon and re-summon his cultists, warriors and Greater Daemon.