I’ve been musing about Japanese HMG under Crossfire. The official rules make them expensive rifle squads. Personally I challenge both the reduced firepower and increased close combat ability of these heavy machine guns.
In World War II the Japanese issued three 5cm Mortars to every Rifle Platoon. Standard Crossfire makes the Knee Mortar rather useless. John Moher reinstates them as an effective piece of combat kit. And I do the same, but in a much simpler fashion.