Where to find a Minecraft MOD like this? (PC)?

Something on the lines of World Generator Tweaks, so I can reduce/increase ore densities, world layers, lava generation etc.

If this can be done without a MOD, how would it be?

I'm simply trying to find a way to make minecraft's mining aspect *harder* and *less rewarding*, so the need for Industrialization is greater. As it is right now, mods like IC2, EE2, BC are pretty useless as they don't earn as much as a bit of pick-axe digging does.

Better yet if there's a Minecraft modder out here who's with free time, I could possibly have a use for your services.

Try Skydaz. It really helps me a lot.