Something else comes to my mind about Mexico and map boxes :
Remote map Boxes could be completely impossible to attack if there is too much distances. I understand it for the ways crossing the Rockies, but the way south should be easier. It should simulate the fact that the road to California via Tucson is (and was) THE road if players want to fight for California.
For now, if the USA player set an average garrison of one division in California, the only way for the CSA is to turn around to Oregon to attack it, because Oregon is the shorter boxe to Califormia which allow the player not not loose all its cohesion to attack California. This is quiet absurd way to invade California, isn't it ? But i did it twice in PBEM because it's the safest for the CSA...
If Mexico enter in the war, then a second road more south but with the same delay of march should be available.
This should finally avoid the players to block the very long roads for the rest of the game with just garrisoning 2 divisions at one side of it.
So i would set the "short" distance (i mean a minimum of always 2 turns away if good weather and good cohesion, and (much) more if not) :
- From the South West (Tucson) to California, to implement it :
* in the file .../ACW/GameDAta/Regions/1095South West.rgn, replace the line : "JumpLink0 = 1094|27" by "JumpLink0 = 1094|22"
* in the file .../ACW/GameDAta/Regions/1094California.rgn, replace the line : "JumpLink0 = 1095|27" by "JumpLink0 = 1095|22"
- From North Mexico to California :
* in the file .../ACW/GameDAta/Regions/1509North Mexico.rgn, add the line : JumpLink4 = 1094|22
* in the file .../Regions/1094California.rgn , add the line : JumpLink3 = 1509|22
Nest to this, in theory, a link should exist ("long" distance) between Upper Canada and Great Plains.