Hello and welcome to the forum,
Currently it's not possible to change the rareness of diamonds and ores. It shouldn't be too hard though: https://github.com/cuberite/cuberite/pul...#r45543101
If you want to change worlds when pressing a button you'll have to create a plugin. You can find the documentation here: http://apidocs.cuberite.org/
You'll probably need the OnPlayerRightClick hook and the cWorld:GetSignLines function in order to create it.
Edit
It seems the configuration for the ores is already implemented. You'll need to go into your world.ini and in the [Generator] section find the 'Finishers' and replace 'OreNests' with 'OrePockets'. Restart the server and a new value will be added. Something like this:
I'm not sure what the format is of configuration value. @xoft can probably explain things better.
Currently it's not possible to change the rareness of diamonds and ores. It shouldn't be too hard though: https://github.com/cuberite/cuberite/pul...#r45543101
If you want to change worlds when pressing a button you'll have to create a plugin. You can find the documentation here: http://apidocs.cuberite.org/
You'll probably need the OnPlayerRightClick hook and the cWorld:GetSignLines function in order to create it.
Edit
It seems the configuration for the ores is already implemented. You'll need to go into your world.ini and in the [Generator] section find the 'Finishers' and replace 'OreNests' with 'OrePockets'. Restart the server and a new value will be added. Something like this:
Code:
OrePocketsBlocks=coalore:0:127:20:16 | ironore:0:64:20:8 | goldore:0:32:2:8 | redstoneore:0:16:8:7 | diamondore:0:15:1:7 | lapisore:0:30:1:6