This sounds quite nice, i do wonder, does the fill cavern option also fills the caves with stone and ore like there should be? Even if not it does sound amazingly usefull.
Atm caverns are filled with obsidian. Maybe there will be an option to fill the upper most layer on top of the obsidian with a bit of lava...if i get it to work as i have planned...
I do woner about the RND stone, does it make things.. Really random? Like every type of stone on the same level and just about every other block being a other kind? But are the ores still inside of the stones after doing this? Because this sounds soo much fun to do but im afraid of losing out on the ores. (then again, it would work for a no ore from the ground challange.. Makes me wonder if merchants sell platinum now)
Yes, random, wall and floor, ores are still there.
Just create a new map for testing.
First reveal complete map so you can see everything and take a look at it (caverns, ores,...).
Then use fill caverns and take another look.
And then use the randomize option and....take another look.
You can repeat this steps for the other options like convert stone or expand ore.
To save some time you should use a tiny map for your tests...