Mossy Cobblestone needs some love

A single flower's worth of dye can color 8 full blocks of wool, so why does a 9-meter cube of moss only yield one mossy cobblestone? The moss is on the exterior, so one block of moss should yield 8 mossy cobblestones. Bone meal is too slow to create for a 1-to-1 ratio with cobblestones if you want to build an ancient ruins or a large area of mossy stones.

Further, mossy cobblestone should spread to adjacent cobblestone over time, and regular cobblestone should become "mossy" over time if placed next to vegetation (i.e. grass, trees, bushes, moss). This would enable mossy cobblestone farms.

Lastly, all this should work with cobbled deep slate, which is also stone.