Nevertheless, returning to the roads...
ACW is not the same as Napoleonic wars, but in several battles of the ACW roads did play a significant role. Chancelorsville jumps to mind, as Jakson's corps used Brock Road and then Orange Plank Road to turn the right flank of the USA Army. In Gettysburg I also seem to recall roads playing an important part, and I am sure other examples exist.
I also think that the idea that in a tactical scale roads were not important, only at strategical level is not completely right. If an entire Napoleonic Corps in a road would be miles long, in a tactical level we are talking of single brigades, even regiments, in road column quickly traversing woods, or going from one flank to the other, etc.
SoW Gettysburg models this right, IMHO. Maybe in the Napoleonic times forces were not so mobile as in the ACW ?
Just some thoughts
Regards