Small mod with helpful things for building in Survivor mode which add:
Yes, with this your shovel or pickaxe (vanilla and modded too) will dig 3x3! With Shift key will disable this feature and the shovel will dig 1 block as normally.
Scaffold like ladders and crumble if you break the bottom block. Right click with scaffold in hand will build scaffold on top scaffold's tower.
Improve Big Hole enchantment.
Work with Silk Touch and CoFH Smelting now and BetterWithMods (it should be).