They are planning to add Mystcraft to the Mindcrack pack, but it has some issues in its current update. I don't quite remember what the source of the info is, but one of the Mindcrackers mentioned it in one of their videos.
The recipes for GregTech aren't the "hard versions" they're actually the normal ones for the mod. They got toned down in the first place. GregTech aims to make everything more endgame-ish.
i feel like the world is going to get destroyed with no mystcraft D: hopefully it doesn't end up looking too messy
I'l add to the rules to not leave old quarries open to the air. Either start underground or cover the hole with dirt when you are done. If you want to leave a stone border where the quarry was that's fine. The other option is just set them up in the ocean.
I was about to experiment with this when the server got reset, also to cover an unsightly quarry. Not so much a rule, but more a suggestion for those who're concerned about how the local environment'll look post-quarry. http://thetekkit.wikia.com/wiki/Terraformer