Versions 0.8.0-0.8.1 seem to remove sand-to-lava (and probably lava-to-sand), which I was using on Maraxsis. I can't find an option to restore it. Was that intentional?

It was not intentional. But I know exactly what I've done wrong, and I will fix it with the next patch. This should be done by tomorrow. Thanks for the report.

No problem; thank you for the prompt response! (Don't worry about taking your time, I can just use 0.7.2 until you've updated.)
I love all the Space Age crafter expansion mods, and this one is no exception. (I'm hoping to publish a small one myself at some point—not so much new recipes so much as allowing mod recipes to be crafted in thematically-appropriate plants.)

Thanks for making such a fun mod! ♥

0.8.2 has sand for the Maraxsis only case. I thought that most have AAI or something.
Also: if you want the balance of the sand:stone ratio something other than 2:1, as it is in AAI, just tell me. I haven't played Maraxsis for a while now.