The fictional Mi-48 what is combination of Mi-24 (cabin), Mi-28 (fuselag shape and cockpit) and KA-50/KA-52 (co-axial rotor) where it should probably have best features from all of them.

Mi-24 for troop transport or extra ammo.
Mi-28 for radar, co-pilot and armament.
KA-50 for high maneuverability, speed and lift.

Mi-48 yaw is too low and pilot can not change helicopter yaw above ~80km/h.

The yaw properties should be raised so Mi-48 pilot can change yaw about 150-170km/h but not faster speeds as the Mi-48 does have a cabin (Mi-24 style) unlike KA-50/KA-52 whats does have unlimited speed to perform a flat turn.

And while doing so should slow down speed to 80km/h sideways so pilot can still perform a funnel.

Mi-48 should as well have a higher lift power and collective than traditional helicopter rotor setup because engine power isn't used for counter-rotating rotor (up to 25-30% is saved) what gives higher power transmitted to speed and lift power (even that RPM is kept constant ~60% engine power).

KA-52 can as well achieve same cannon firing probabilities as AH-64D with rotating cannon because fast yawn turning rates.

Mi-48 should maneuver well in yawn and collective performs but having current lower roll and pitch performances for gameplay reasons.