lets say I have 7 0.5x0.5 wood blocks, or 7/8 of a normal block. when placing those blocks in 0.5x0.5 mode, it works fine, but by placing it in 1x1 mode, I have effectively used 7/8 of a cube to make 1 cube. This isn't that bad, because picking up that cube still gives me 7 1/8 cubes. the real problem is that those small cubes can be picked up seprately and used to make full sized cubes.
ALSO if you have a cube thats 0.5x0.5 and you're on 0.25x0.25 mode, the 0.5 cubes seem to become smaller? this might be a bug only for me