I think about this pack way too much (I thought writing the FAQ would be carthartic, but no. Now? I'm sitting here, refusing to play until 0.7.2 hits the launcher..) So I have some crazies to share.
A passive mechanic that restored the world. Something you start mid-game and as you progress into late-game, improve upon. Something more subtle than the Witchery, Blood Magic, and Thaumcraft methods.
You place a block, say, an n-tuple compressed dirt in the world, and it slowly spreads out and becomes a plains biome, sand begins a desert, wood types for forests/jungle, and so on. A very slow spread to start, one neighboring block per Minecraft day, and an end game item/spell to double or triple the speed. Requires extraordinary amounts of mana, RF, altar power, essentia, or blood. Or all of them, a hot mess of altars, spreaders, golems, pipes and tubes all feeding the system. (Lag doesn't exist in my imagination.
)
Something akin to the Witchery Icy Slippers, except, when you walk over cracked sand, it turns to grass.
Late game mechanics could pull ores out of the nether and put them back into the overworld, another to take mobs out of the nether and turn them into passive overworld mobs. They are confused and scared, fleeing from you or attacking until you've shown them you care. Oh, and horses.
Villages regenerate, but the villagers are scared and won't breed.. until you gift them enough emeralds, wheat, carrots, and potatoes. Then they'll trade with you and have the resources to reproduce and sustain their village (ie, return to vanilla behavior).
(Seriously, did I just contemplate Regrowth fanfic? I did. I'm not ashamed... I learned it by watching you,
@Raetac!)
It needs said again: Great work,
@thephoenixlodge. You are an inspiration.