Do module stack?

[Kinakin]

Thinking especially about teh Sjet and the armor module that can have 2 of em. I know the reduction in crew requirements stack but does the increase in fire rate stack aswell?

[Postron]

I think this depends on program mechanisms whether it adds a bonus or just unlocks a bonus
the easiest way to find out would be to take a slow firing weapon (missile 1shot/32s base) take a watch and try out how long it takes with one and with two in the weapon test mode

[Kinakin]

they do seem to stack. atleast the reduction in crew requirements stack

[Postron]

i think you are right, just looked into the file :
"<RateOfFireBonus>0.1</RateOfFireBonus>
<CrewEfficiencyBonus>0.5</CrewEfficiencyBonus>"