Well, the whole point of a mod pack is for people who don't want to edit configs and stuff. I (and you) may not have a problem editing configs, but some people do, and that's why they chose to use this. The inability to edit configs come at a price, which is this.
But I don't understand why they don't have Ultimate: Easy Mode Gregtech (and maybe Ultimate: Hard Mode Gregtech). It'd clutter up the launcher, but it wouldn't lead to any Gregtech related thread to end up in a flame war.
It's a hard choice for them to choose, maybe someone should create an easy config editing guide, using Veloctician's Ultimate Config Pack, or just going in and editing them themselves. But even then, people shouldn't have to go edit configs to play FTB. I only started modded MC because I thought it was one "super mod", but having to fix id's and other things are a chore in itself that I frankly don't want to do.