Keldorn 说:
Strange here I get no lag. Maybe it is the number of corpses + the smoke from the rifles? Your pc is old?
Could be the smoke of the guns if any...
If you plan to change the map to a north-america one in the future you could even add a french faction if you feel up to it, since there was french intervention in Mexico by that time (http://en.wikipedia.org/wiki/French_intervention_in_Mexico).
It is a great idea !
About the weapons I think you got all of the most important ones right (including the firing capacity of each one). Springfield and Enfield Rifles were the most used weapons of the civil war.
I think they should be cheaper and have more precision, particulary springfield, and be slower, but that's just my opinion

Oh, yes, and... not usable on horseback for Springfield ! The Enfield Rifle is more suitable for that ! Shorter and less encombrant.
The Henry Rifle you introduced was the father of the repeating weapons, followed by the cheaper Spencer that was a much prized weapon at its time and both changed warfare forever.
Concerning repeating weapons, it is a god idea to include them but the problem is they are the best gun of the game and their price is mostly the same as the one shot guns. So when you have one of those guns (and they are in every market) you are undestructible. The reload time sould be longer (you have to put 16 rounds in this !) and they should be more expensive, IMHO, of course !
Here is the idea : (the values are realtives, not absolutes)
1 : springfield, slow, relative indice of precision of 9 or 10, not usable on horseback and having a ratio of price of 2.
2 : Enfield, slow, relative indice of precision of 8 or 9, usable on horseback and having a ratio of price of 1 or 1.5
3 : Spencer, fast, relative indice of precision of 7 or 8, usable on horseback and having a ratio of price of 3 or 3.5
4 : Henry rifle, normal, relative indice of precision of 8 or 9, usable on horseback and having a ratio of price of 4 or 5.
5 : Kentucky Rifle, verry slow, relative indice of precision of 6 or 7, not usable on horseback and having ratio of price of 0.5 or 1.
The revolvers too were very popular, used mainly by officers, cavalry and artillery crews. LeMat was very popular amongst the confederates (btw it could fire 9 shots, I don't know how much in the mod because I don't use revolvers, and one shotgun-like projectile from the lower barrel). The colt was the most popular and widespread for being cheapera and for having a improved loading mechanism (6 shots I think).
Concerning revolver, I do not have comment right now. I just think they should be a little less precise and take a little more time to reload.
Weapons I suggest:
1862 Kerr Rifle with scope (one kick-ass sniper rifle of the time, manufactured by the british based on Sharps Rifle);
1861 Whitworth Rifle with scope (also good and more portable);
1859 Sharps Rifle with scope (another good sniper rifle);
Scoped rifles could be verry interesting ! A verry good precision, and could be introduce the sharshooters in troop tree
Army model 44 Remington's Revolver;
Parrot Artillery (a regular cannon with canister ammo);
The Napoleon Artillery (fired a canister that exploded in thousands of shards);

Gattling Gun (essentially a primitive machine-gun with 6 rotating barrels).
About heavy artillery, I hope there is a way to introduce them in the game. But we must be verry carefull not to do them as god-weapons. A verry low rate of reload could be the good tweak.
The same concerning gatling. I played "WWII china" mod and there is a machinegun. When you have it, you face all the armies alone. The gateling should be verry expensive and verry heavy, so the bearer cannot run and hide

(unless it is possible to mount it on wheels or support, as in reality)
The last three are the coolest, but I imagine they must be very hard to implement since they are pieces of artillery. The scoped weapons can, of course, also be implemented without the scope too. Credit me for the idea if you implement them?
I hope it will be done, because I think a time like this one is not complete without artillery.