Brucka: I'm thinking along the same lines as you are about the melee.
The number in the charts represents the number or less that you need to roll on a D10 to get a hit on the opponent unit.
I've been using the Light Artillery 4lbs or less for my battalion guns, but this has proved to be too powerful at close range as the,guns get double dice at short range.
Now I'm thinking that the battalion gun gets you an extra 1-2 dice to,roll as part of the infantry dice roll. For example, a battalion that has 16 figures gets to roll 4 dice ( (1 D10 per four figures) so I'd give them one extra D10 to roll. So,if the infantry needs a 5 or less to get a hit, then in this scenario you would get five dice instead of four.
Now I have to figure how to allocate incoming hits on the battalion gun or on the infantry stands. I'm thing that I would simply remove the battalion gun after the attached infantry battalion loses one stand.
I assign a battalion gun to pairs of battalions. I paint Regiments as two battalions so the regiment gets to have one battalion gun.
Lots to ponder here, butnthis demonstrates how you can adjust the rules and experiment without having to change the charts.