Also, deficit spending might make the game more interesting, but it would also make it a lot more complicated. How do you plan on incorporating government bonds, interest payments, and creditors?
This is an interesting question. Either, we'd have to oversimplify the deficit process (aka just total up excess spending not covered by revenue), or have to find a G.M. willing to help us handle things like that.
My hope with this is not to produce deficits for the sake of it, but simply to give us more flexibility. And in addition, since this is a game foremost, as you pointed out, this has the potential to make it more interesting.