If we're still on the subject of a hypothetical Economy overhaul, maybe there could be a system where different populations have some kind of wealth/prosperity value that gets drained by stuff like taxes and trade good shortages but boosted by things like government spending in the population (probably mostly in terms of installations, but maybe to a lesser extent military units and ships stationed at the population, representing them spending money on stuff when they have shore leave or whatever), civilian mine activity, exports, etc. It would probably effect the rate of civilian mine foundation and expansion in the system, the construction of civilian ships, and maybe the production of trade goods. It might make civilian shipping lines worth protecting/targeting, since disrupted shipping could cause economic problems.
Also, I was thinking that maybe transnewtonian minerals could become a new type of trade good (not as each individual mineral, but just in general) gets generated by civilian mines sending minerals into the civilian economy.