Slime Chunks and Slime Changes (also Magma Cubes)

I think slimes should also spawn on the surface in slime chunks, and slimes could also be able to put out fires they land on, and be immune to fire, and if they are submerged in lava for 2 seconds they turn into magma cubes, and if Magma Cubes are submerged in water for 5 seconds they turn back into slimes, redstone people would probably like this. Also a Slime Layer block would be left behind by slimes with a 5% chance of appearing when a slime hops, a wider radius would be left behind by bigger slimes, and would work like snow layers, and would be craftable like a carpet but with slime, same thing with Magma cubes but with Magma Layers, and Slimes and Magma Cubes should drop more of their respective drops.