Get the Imperial Assault Campaign module for Vassal from http://www.vassalengine.org/wiki/Module:Star_Wars:_Imperial_Assault
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Being able to shoot through
friendly figures is a limited, specific character trait, i.e., Mak Eshka'rey
Mak's class card Target Acquired grants the ability (with strain cost) to ignore figures when determining LoS for the Campaign.
Also, in the campaign, Mak's Covert (when not wounded) causes Mak to be ignored if an imperial (i.e. hostile) figure makes an attack more than 3 spaces away from Mak.