Do you mean like, to disable just coal, but still get iron, lapis etc? You already can disable ore generation completely under Isle/settings
As much as I would love iron prices to drop down, this would be the worst way to do so. All the ore generators have been causing a lot of lagg recently, and implementing this would just worsen the problem. The current setting is good enough in my opinion, if you'd like to fully afk iron farming, I'd recommend chainmail/iron drops from zombies(they drop iron tools too unlike skeletons), although you'd require a Drop Inventory hack to automatically sort armors yourself(drop everything that isn't chainmail/iron or the rare diamond pieces into lava).
Idk I've just noticed tps exponentially getting worse since their popularity started. My point mainly was that this would devalue iron completely, as you could just afk a whole day, and the next day you'd have stacks of iron ready to be collected without the hassle of mining other ores.
