For future patches, I am wondering if the game system can accommodate an arrangement like ACW where particular reinforcements appear in their historic regions. For example, the Nationalists have a number of infantry whose names are associated with a region, e.g. Andalusian Requetes, Castilian Falange, Morrocan Regulares, etc. Yet you can build any unit anywhere - they need not appear in their historic regions of origin. It would be nice if it was like ACW where regions/states served as places where their associated regional units would appear. Units without a regional association, e.g. regular Spanish Nationalist infantry, would appear at a random controlled city anywhere. Certain types of new builds (like artillery or armor, rare as they are) could appear in ports, factories or the capital.
Another thing is that, if this system is instituted, builds should appear randomly within eligible (e.g. controlled) cities of that region, again, a la ACW.
Taken together, these would address an issue I see with new unit builds, namely that a player can build all his units in one city. Currently, for example, if the Nationalists or Republicans want to overwhelm one sector, and they have enough to build twenty new infantry, they can place all twenty of them anywhere on the map in a single location. This doesn't seem logistically reasonable or historic.
Again, I think this has already been done in ACW so I think the engine is capable of it.