Krieg Regimental Doctrine:
Anytime they take a Combat Attrition test, they ignore all modifiers.
If a character or vehicle unit is destroyed, but the model did NOT explode, roll d6. On a 4+, after the attacking models' unit have completed their attacks, the destroyed unit may fire one Ranged weapon, or make one attack with its melee weapon (for models that possess multiple tracks, it is considered to have a wounds of 1). After resolving this attack, the destroyed unit is then removed.
My thoughts: Being able to ignore modifiers for Combat Attrition checks isn't bad. Being able to shoot once or strike back with a nominally 'dead' unit is pretty sweet.