First I would like to point out this is a great mod. You guys have done a wonderful job within the limits of the Empire engine. I had an idea though and I'm sure someone has already thought of it.
Is Area of Recruitment possible in Empire? If so you could make it so that units like Texas Brigade only recruit-able out of Texas. Or assuming you're keeping with your current general system only allow them to be recruited in their home region. IE Robert E. Lee in Virginia. Could even go as far to make say a regiment of infantry regular or otherwise recruited in say Tennessee is labeled as such to represent the idea that the armies raised were usually named after the area the army was raised in. I don't know how hard this is for the coders and I obviously don't expect any time soon or ever for that matter but more just a suggestion. I think it would add a lot of strategy.
On a side note I can't wait for someone to figure out how to redefine provinces as that is the only real downside to this mod. If we could redefine and add provinces to the point where we could actual represent the states at the time I would probably never play another Empire mod.