Description of feature request

What if during cave shaking [or whatever it's called], parts of the cave fall/collapse onto the ground? this could be done using the block clusters. this also could be configured to change stuff like: Chance, Amount, Size, and what blocks can fall. this would also make it so that caves are not the safest option now (making the nether somehow safer).

Sorry if somebody said this before btw I looked but I didn't see anyone.

It would look nice

Now THAT would be cool!

surprised this wasn't done initially