Actually I read about Railcraft and noticed that the mining-bore detects ores via the Ore-Dictionary. I guess most people don't like to fiddle around in config-files, so it possible to mine Ores found in the dictionary?
This might cause a problem, because rubberwood is managed via the dictionary too, but maybe it still is an option (I don't think a miner would actually come across rubberwood if used under normal circumstances).