Hmmm,
Well I have no idea if this can work but maybe a weapon that does little damage but has a negative supply usage (drains life energy and transfers it to your ship!), or reasonable damage and a little negative supply? Any idea if this would work?
Not sure about non weapon components but for facilites maybe make races with advanced necromantic ability have slightly better Intel generation (maybe even on the standard Rogue Training Camp), its not so bad to kill someone before interrogating them or even during
.
And of course better Troops (the non monster ones, they are already dead!) and boarding parties (higher tonnage to destroy)