One downside I find often is that when you install Industrialcraft, and you have this nice big world allready with lots of neat stuff on it, is that you can't easily find ores because you have explored so much. So what im suggesting is a tool to generate Industrialcraft ore deposits in a world, and it is entirely possible because you can get the seed from the level.dat, and the same seed always generates the exact same ore deposits.
There could be a few different options, like only generating ore deposits in smoothstone, or a forced generation option where it adds all ore deposits that would exist if the world was started from scratch with the same seed, no matter if the would be in the middle of a building or mid air or something similar.