
So in my opinion anything that explodes in a quirium blast and has quirium in it should cascade.
This excludes (ordinary) asteroids (which only cascade in 1.72.1 due to a bug; haven't done it before), alloys, cargo (all of these don't have quirium in them—apart from fuel tanks, of course—things are getting complicated again :sigh:; perhaps for the sake of simplicity we should pretend fuel tanks don't exist), and main stations (these don't explode in a quirium blast).
Everything else should cascade: ships, derelicts, dockable objects other than main-stations (as far as they explode in the first place; there may be non-main-stations with a high enough energy to withstand a quirium blast; most of LB's stations come into mind).
Still one can argue about the derelicts. Everything else seems pretty straightforward to me.
As far as I think, these are quite complete lists. Now the question is how to code the distinction.