I also like TBest idea for having a city cap on a territory
Em, I was thinking like 5 cities a player. Thus, a player would be forced to stack those cities. (like real life basically).
But sure a cap per terr might be worth as well. Anyway, this is why writing a specific suggestion is smart. I am not sure what the best approach is and don't play as much commerce as others, so my experience is different.
@OP, Sure adding to base game is best. But WZ has one dev, so he can get around to that in... a few years? after all the other things on the roadmap. Wheras I can make a mod in 30 min and Fizzer can see if the mod is worth adding to wz at some point.