A really nice mod would be an animation pack... As follows:
Running with a gun should stay how it is, since when running with a gun of the era, it was incredibly hard to keep it at shoulder, and would do serious damage to shoulder from the bumps. It would bruise the shoulder severely, and when the soldier shoots, his shoulder would get even more damaged from the massive recoil of the guns. However, let's say we do want to change the running animation of Infantry Muskets, I say this one is great...
A polished version of this...
Remove the stiffness, leave the arm going over the chest to hold the gun to the shoulder. This is how many soldiers ran with muskets. It was a slightly more comfortable, and less hurtful, way to run with a musket.
[youtube]http://www.youtube.com/watch?v=8TnxkgNtV68[/youtube]
Walking with a musket should entirely be changed. The way FSE did NW's animations really annoyed the shit out of me. MM had great animations, and if they just polished those, it would have been very nice. The animation should have been holding the gun from the butt, and keeping it on the shoulder. Or, hugging the gun to the chest with your arm. I shall show both...
Walking...
Marching, holding by the butt of the gun, held to the shoulder. This form was the most popular across many nations, such as Britain, Russia, the Ottomans, Austrians, Swedish, etc.
I figure this is the opposite. This is sort of "hugging" the gun, and pressing it to the shoulder, I'm unsure of the actual name of the stance. This was more popular with the more prestigious armies, such as France, Prussia, some Russians (often Guard Units and Grenadiers), Spain, etc.
In a prior post by KillerMongoose, the L'aigle weapon firing animations are near perfect. The only problem is how they hold the gun when firing. Back in the day, the soldiers were told to keep their elbow up, supposedly to control the recoil of the shot. Wasn't very effective. L'aigle's animations are that of a modern shooting style, which does control recoil of the gun. However, FSE did good leaving the elbow up when the player shoots, but not having the players' had turn when shooting. Without turning your head, the flash from the gun could blind you, along with the sparks from the hammer if the gun is not held and shot right. I'd love for someone to make these animations as I said, as for rifles, musketoons, etc., leave them how they are, if possible. Since their smaller guns, they should keep the more "loose" animations for carrying them, since the soldiers historically had no real way of holding that type of gun. I'm sure, the British made their Riflemen hold their guns like that of a lineman, but the baker rifle was also longer, so it was easier and more comfortable to hold at shoulder.