Many thanks to yarrow and kathyann for useful leads.
Of course, it makes sense that this is a generalist forum - my apologies for
pestering with a specialist question. I will see if I can turn up anything
at gardenweb.
As for "of course you can use it for compost," if you dig just a little
further into those google results you find enough scientific studies
indicating allelopathic effects from root exudates and foliage to give pause
before applying it to your garden.