Can you add a config to disable the generation of marble?

Theoretically speaking you can set the biome-restriction for marble to whitelist instead of blacklist ("whitelistbiomespecification") and remove all applicable biome-types from the biometype list ("biometypes") to achieve the same effect.

Though that is not trivial to see at first glance, so, yes, this straight-forward option will be included in the next build.

I don't even see where I can set the biome black/whitelist for marble. For The structures and ores I can see it but not for the underground generated marble.

Right.. derp. :|
Yea, i'll tackle this in the next update.