Are you sure? They behave individually (about mass) like their parent bodies behaved before being turned into dust.
Like with my cage experiment. The cage is made of Eta's (110suns), if I place anything with less mass than that inside and "dustify" it, all the dust will be consumed by the cage, no matter how many things I dustify (I just invented a new word lol). Now If I place a 130suns mass star inside, it will escape the cage.
In other words, the dust only interact with bodies, not with other dust. But it does interact in some way or another.
How do bodies attract the dust then? Some hard coded nasty algorithm?
Anyway back to his problem, he could create the debris, preferably manually, by editing the xml. Way easier. sed ftw