Hi! I am working on a modpack, and I thought it would be helpful to have Rock Crystal Dust made on the Grindstone. However, I am not able to do this, because of the special handling of Rock Crystals. Instead of breaking when Rock Crystals are ground down to 0 size, can they become Rock Crystal Dust, or can they drop Rock Crystal Dust as they are ground down? Thanks!

This could potentially be a config file option for modpack devs, as the dusts don't have any particular application by themselves.

what purpose would the dust serve?

Grindstone won't be present in initial 1.14 mechanic changes, so irrelevant.