LH Suggestion: Make number of units a bolt goes through depend on armor!
As the LH FAQ states an x-bow bolt goes through five units standing in line. Basically a nice idea. BUT seriously:
Would you expect an x-bow bolt to go through the same number of units if at least one of the first ones in line was clad in chain or full plate or had a shield as if they'd all be in leather rags? That would be the same as a fireball doing the same amount of damage to all units no matter how high their fire resistance was.