Whilst all command and support radii remain the same, since command is difficult and frustrating enough as it is, as evidenced by the opening moves in this game, with all units remaining in march column far longer than was healthy! Movement is halved to 6 inches per move, and there is no firing allowed if a unit moves twice or more, per Epic.
However for this game, I decided not to halve artillery range. Effective artillery range of just 1 foot simply doesn't look right, even at this scale. So a 4 gun "Napoleon' battery will be rolling 3 dice at 6 inches, 2 dice at 24 inches, and 1 dice out to 48 inches: 3-2-1. A 6 gun battery will roll 5-3-1. This seems to provide a more realistic representation of the relative effective ranges of rifled muskets compared with field artillery.