OK, had two ideas for gear:
--A Mecha Blunderbuss: Kind of an auto cannon, but the thing just shoots in a pretty wide arc. Short range, accuracy goes to hell over a long distance, but is pretty destructive at short to point-blank. As Blunderbusses, guess there could be some kind of special rule that you can shove in debris for special damage effects or boost the penalty to dodge or something.
--A Crippler Calculation Computer. Add-on to weapons (guess ranged-only) that scans an enemy and provides you with a description of the best point to shoot them in the limbs (dunno what could that do aside from the obvious to-hit bonus... attacks get a bonus to cripple, an increased penalty to saves to avoid being crippled...?). Obviously probably works best if you use it against enemies like, say, the Necromorphs (those things from "Dead Space").