Afaik it's impossible,you can only make weapon that does great damage to hull,but very small to shields.
hull_damage = 2000
energy_damage = -900
This way you get 100 shield damage and 2000 hull damage;
energy_damage = hull_damage*0.5 + energy_damage(in non-moded FL);so if energy_damage is negative,then it is smaller.

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I think he means if it's possible to create a weapon that deals hull damage, even if the shield of the target is online. Unfotunately, I have no idea which parameter is the right one to make this possible