To clarify what I had planned:
Since as I understood it, ChromaticCraft only generates it's stuff properly in the overworld (partial gen in RfTools, and broken gen in Mystcraft), I was going to have dim0/Overworld be for people who wanted to work in Magic (one, maybe 2 players would fit that). Access to the overworld isn't impossible, it's just not the starting location. (Twilight forest is).
Nether/end: ... Hmm, so I didn't think that clearly. Strongholds only work in the overworld (they gen in ages but do not work in ages). Nether: I had planned for a link book to the nether.
The goal/intention was to permit would-be mages to set up shop in dim 0, and not bother anyone else; then, they could use whatever magical devices they make elsewhere. Similar to a tech person generating a massive RoC setup, and then taking their tech devices elsewhere.
But a RoC shaft can go through a world rift, or a crystal portal, or a nether portal, or a twilight forest portal. (hmm, can they go into RfTool's dimensions?). Or an industrial coil battery can be brought somewhere (although not nearly as nice post V6), or the power plants can be moved.
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What worldgen options work well with ChrC in the overworld? Last I heard, only vanilla, Climate Control (vanilla with a better biome layout), and ATG worked, and ATG's gen was problematic (although I don't know exactly why). Is this still the case, and what works best for it? (1.7.10 native doesn't make much ocean for the ocean structure, Climate Control can provide more oceans, as well as a better balance of hot and frozen biomes).