Order in which weapons fire?

Sorry if this one's been discussed already:

Is there an easy way to know in what order the weapons on a particular ship will be fired? Is it the order you add them to the ship (First added, first fired)? Or in order from front to back, left to right, etc etc?

I ask because it would be nice in certain strategies (e.g. have the shield depleters fire before the crystaline weaponry does)

In my case, I'd like to make a set of "dummy missiles" that go in just before the actual warheads to soak up the damage. Perhaps have the dummy missiles with extra structure, ECM, etc. But without knowledge as to have them fire first, I'm afraid I'll end up with a system in which the normal missiles absorb the PDF for the dummies!

Cheers
Jim