I'm in 1.5.2 unleashed so I am stuck with mystcraft 0.10.5 or whatever it is that he hasn't perfected the random symbol adding yet so it's not completely finished and fixed. I had a question, what symbols would I need to make it eternal night and in what order?
Zero Length, Nadir, Normal Sun (Nadir is the opposite of Zenith)
Or try Dark Sun, never used it but it should work also.
For 1.5.2, you could try to spam symbols if you want a quarry age.
Stone Block, Tendrils, Stone Block, Tendrils should get rid of caves. Then a couple of other symbols, to cut down the amount of random stuff. (Huge Trees, Surface Lakes, Obelisks, Villages, other surface features that doesn't get in the way of getting solid underground.)