As I put in another thread, I think it would be a large improvement over the RTW campaign map if you could move large distances through your own territory but less in enemies provinces. This would symbolize supply lines, unfriendly natives, ect. This would allow you to move at a good rate though your own empire and yet not be able to rush enemy settlements. The disparity between attacker and defender movement points would also make it easier to intercept invading armies before they reach a settlement, creating more field battles