Hey, I have some ideas, I think that the game would be awesome with them.
First why don't you have a system where your population would give you taxe income that would normaly be 1% of your population (ex: 250 pop=2,5 - that we round up to 3 coins per day) this 1% would exist if your pop was happy, if the were sad it would be 0.5% and if your were in deficit you could gain 2% at the cost of 5 happiness/day, this could be an option given by a new character a tax man.
You also could have sistem where after the pop metter you would have a soldier meter that would have your amount of soldier so that you would have to maintain an army to for ex: help the sultans' town. In that system to maintain a total of the 1% income you couldn' t have more than 30% of your pop has soldiers.
I have been thinking in other ideas but for now i think that these are the best for you to have in the game.
Also if want i can translate the game to Portuguese and Spanish it would be ny pleasure, and no payment need. If you want just send to may mail the data and I'll get it done in 2 week max.
Hope you see this!