For the physics, the world is solid, so no problems there. But I know what you mean, I tried a new world, superflat all dust, but added in mineshaft. That didn't work out too well, next one didn't have mineshafts. With the current build, glowstone blocks don't help hold up other blocks, but if they get that fixed, I'll try using physics again.
Certus Quartz, can we get either a recipe to craft/smelt it from dust? it doesn't have to be a simple 1:1 like AS had it. 4:1, 9:1 or needing an induction smelter would work.
Ah, yeah. Quite. Fixing recipes and such is one thing that is ongoing. And yes, I will tweak that for the next version.