This mod adds 1 enchantment for tools called Multi-break, which can have 3 levels. Depending on the level, it will allow to break 3x3, 5x5 or 7x7 area of blocks. Multi-break can be suppressed by sneaking.
Block outline color and transparency can be configured.
myfriend told me he crash when use on bookshelf and dirt, he was using shovel with multi break enchant
if shift break is ok, but when normal use will crash. havent tried on pickaxe.
edit: tried with pick, on creative it works but on survival - crash. ill pm you the crashlog
nice was looking for something like this, though if I may ask, is it an enchating table thing or do you find it as books? or both?
In reply to treppppy:
It's both