I kind of want to make a hardcore mode world with the harder configs, but I'm scared. What do those configs do?
I've been playing with the harderMF settings on 2.0.1 of magicfarm. I haven't noticed a lot of changes. Most of what I did see changed were normally blocks I didn't do a lot with anyways like the auto-enchanter. Although from the change log, it looks like those blocks were re-enabled in the latest packs.
The biggest change I see in the pack, is that you do not get automatic enchantments to the TiC tools as you level them. You only open up modifier slots instead. This means no haste or fortune/looting automatically on lower tier tools. You have to put on the modifiers yourself. Since several of the modifiers require things like redstone, nether quartz, lapis, obisidian and the like, you won't be able to add any of these until much later in the game.
The other thing I've noticed, but not sure if this is global or due to the harderMF settings, is that non-magical biomes are extremely slow to grow crops. I had a cactus farm and reed farm in a meadows biome, and even after a couple in-game weeks, I only had 1 stage of growth on a couple blocks. After I converted the area near the reed farm to magical forest via a silverwood tree with a pure node, the reed farm started taking off. The cactus farm however, was still out of range of the biome change and was barely growing.