If you use Mystcraft with this pack, please remove it. It's superbly unbalanced. Instead, use the mod RFTools. It's WAY more balanced. You need power to create dimensions, dimlets (Mystcraft pages equivalent) need power and a bunch of resources to craft, plus you need power to keep the dimension running. It also adds a bunch of machines, all useful and all have balanced recipes. It even has its own amazing wireless redstone system. It also has a manual to tell you how to make stuff. Definitely recommend it if you think Mystcraft is unbalanced and you want more uses for precious RF. I think the pack could use this mod, actually.
While I do agree RFTools and the dimension system is pretty darn awesome (added it and played around with it), it's actually just as unbalanced as Mystcraft is without extensive config changes. Every auto-added dimlet, like all the gregtech ores, seems to be at the default RF/t costs and rarities, so they're not hard to find and cost virtually nothing in RF/t to use.
It'd definitely be cool to see this put in, but I don't know who would want to go through and edit all the dimlets D: