This is a brainstorm of ideas for mods, tweaks, etc, that would balance the technic experience. While still keeping the feel already associated with technic.
So here is a bulletpoint list of ideas that would make the game more challenging.
Environmental:Cave in's (makes using the destruction catalyst a bit more risky)[good example but not updated http://www.minecraftforum.net/topic/157524-v181ogreseans-mods-mods-updated-for-181/#12] , tornados (http://www.coros.us/mods/tornadoes, would cause you to worry about your quarry's, farms, etc.), volcanos (currently waiting for elloram to add features to her volcanoes.), Water related (Jakj has been a boss and added compatibility with finite liquids),
Mobs: One idea is to have some resource in a better dungeons chest that is necessary to progress, and is unobtainable anywhere else. Digging zombies, zombies that don't take knock back, mobs that will use balcons weapon's mod weapons (zombies with a diamond battle axe, skeletons with a blunderbuss, creepers that spit dynamite). Endermen who see a industrial machine/mechanism/pipe etc, will teleport to it and pick it up.
Survival: Thirst, faster hunger drain, slower health regain, if you bump into a block while walking backwards you trip, (same thing if walking backwards and you fall a block),
Please comment with ideas, criticism, and for those who know java, which would be easy to implement.