hi, i wanted to ask if it's possible to relase the cave-ins and falling block system with the ability to define support beams as a standalone mod for 1.12 at least.
i personally think that how terrafirmacraft handle this is in a pretty deep way and it would be a good feature as a standalone mod for those modpack where adding all the other things from terrafirmacraft is a bit problematic.

basically this will need to have a config to define blocks that will cause cave (stone behaviour) ins with a config for the blocks they will turn into, blocks that need to be supported by terrain (brick behaviour) and blocks that can't stack (dirt/cobblestone behaviour)
also the ability to config what blocks are support blocks

Nope!

In 1.16 with the additional customization options made available by data packs, everything you just asked to be configurable already is. We're still very likely not going to split it into a separate mod.