Couldn't this be manipulated to stop your tools taking damage? For example, you start mining rock with your tool, stop just before the block is destroyed, then just punch it with your hand. Obviously you won't get the block but that won't really matter if your clearing out space or something.
I love this mod but I had to drop it recently due to Forge : /
Any chances you could make a Forge version too? I know there's no 1.8 Forge yet but I'm back to 1.7 for now anyways so maybe a 1.7 Forge version?