Suggestion from me: subspace-encased is a qualificative that can generally pierce shield. Can this be used?
This truly reminds me of the Phasor beam. The Phasor cannon generates a trans-warp beam of energy that actually exists in several dimensions simultaneously, thus damage to energy related matter (shields in this case) take serious damage, and the right calibration of the weapon can easily pierce the target shield. Note that calibration can be contered by multi-phased shields. Also, Phasors deal large shield damage, but little armor, structural and system damage.
The Phasor is almost completely useless against heavy armor or energy dampening defensive fields, and its effect are greatly decreased by systems that can absorb energy.
The point was less dangerous weapons could be used to replace it, and that it is unreasonable for a government to use a weapon with side effects such as these, when the weapon is ment to take down computer systems, not people.
And this part reminds me of the good ol' Ion cannon. I'm sure that most of you have heard about the sci-fi effects, but here goes.
So, the ion cannon is basically a particle cannon, but the particles are electronically ionised. Thus, any damage that penetrates the shield bypasses armor and structure and is dealt directly to overloading the craft's internal systems; computers mostly. Ion cannon are worksafe and have no pollution whatsoever, and living tissue is only slightly effected. Note: Ion cannons are useless against SPACE MOSTERS (OOOOoooooohhhh!) and organic craft.
Those were my two cents. Enough sci-fi storytelling for now.