I think what's needed is to set a very apparent advantage to having good formations beyond the formation 'buffs.' While the best formations may seldom exist in actual WoR gameplay I think every bit you gravitate towards maintaining them should help you in a few ways. Ideally it would be good enough so that people will prefer cohesion more and even so when on the move. Basically when moving it's from one point to the next in a mob and what people refer to as "line battles" occurs when stationary. There's no advantage seen to moving cohesively. The only time anyone moves in a battle line is when attempting to roleplay. Complex maneuvers may remain beyond the grasp of the average gamer but there's no reason that keeping formations should be pointless in a game on a war where they weren't pointless, where if the formation fell apart the men would generally leave the field as fast as they could. This is of course not noob-friendly and experienced players will serve a practical purpose helping keep order and making sure players understand the value attached to certain behavior.
Lone wolves are still a problem, contrary to what some people want to say, and this will also help to curtail them. It's just too easy presently on most maps with cover provided and with heavy smoke to get among the enemy and cause an entire force to turn around for one guy. A big factor in Civil War combat was visibility. How can we simulate day turning to night from black powder smoke and not expect constant suicidal meelee runs which would have never even crossed the real-life combatants' minds to embark on? The Civil War was vicious at times but I think society is a little perverted today in its perceptions by the sick events of the 20th century and into recent history. Soldier's speak of unwritten code and expectations of conduct even between opposing sides. I have respect for the tenacity of the Japanese foot soldier in the second World War but I don't see why we should be simulating the Samurai code of conduct in gameplay for the American Civil War but that's basically the leeway given to players currently.
I didn't include it, but I think the loss of color from suppression should really only be reserved for the highest states of suppression as a way of the game to tell you that you should have already ran away. Before that there should be various progressive levels of trembling and visual and audio distortions and perhaps an audible heart race, heavy breathing, etc..
https://youtu.be/JjUuaVXTJsY