I wish I had more time to post a proper post, but I felt this part had to be mentioned.
Railcraft hidden blocks are enabled in 1.0.1 and cause alot of lag/issues with just about everything. Every other pack I play that has railcraft has this disabled. Not CJ's issue, it's cause current 1.6.4 forge doesn't properly (or at all) recognize the is.air.block function. Thus, invisible blocks permeate the world and things like pistons, ticon smelteries, redstone, plants, etc... can't interact normally since this block is in the way.
It was causing alot of lag once I built out 3 smelteries to take care of the products from the sieving and couldn't understand why. I was also having alot of lag from nether biomes as others have stated and I speculate that might be it as well since the block keeps track where entities are moving (player maybe only, dunno).
in railcraft.cfg, hidden=476 - hidden=0
With that said, this pack is a breath of fresh air and you essentially made my point from a couple days ago. People haven't even begun to test the limits of HQM and their imagination and this definately is one of those times where I'm glad I tried a random pack w/o knowing what it was about. Truly awesome.
and yes, I love the nighttime where you can see the sun if you look down. pretty awesome.
Another thing about the nether dimensions. Ghasts push themselves through glass or whatever you stick out there to contain the area. So do pig zombies. I'm sure this is a vanilla mechanic but yeah, they almost killed my dog.
He jumped in to 'try' to save me from some errant pig zombies and got down to 1/2 heart. poor pup.
Anyways, awesome idea, awesome implementation, awesome sense of humor and just awesome all around. TY very much!