My guess is yes but of course it will be a bug.
LOL the importance of not giving definite answers for game developers.. gotta have a way open to reverse course.
As for the shield example: Either its not worth grinding for, or everybody else will call "ridiculous" and get it nerfed. I'm afraid there is no "just right". Maybe FD will make the super shield work only in PvE, but in PvP, it drops to normal values, like other game developers have done.
I think a power plant is much easier to balance. It doesn't overpower any particular system, you would just be able to have slightly more flexibility in fitting your ship. (like not having to swap your A rated FSD and Sensors for E or D rated sensors just to be able to install a KWS and such things.
Anyone in a Vulture or FDL won't have skimped on weapons or shields anyway, so the ship doesn't suddenly become more powerful, all the extra power affords is better Sensors, FSD, KWS etc. Auxiliary stuff, not overpowering the ship, but making it a more luxurious, enjoyable flight.