Change Biome Temperature Command/Toggle

A possible command or toggle of some sort to that wouldn't change the biome itself, but the actual temperature. This could make a tropical desert into a frozen desert, and an icey tundra could become a warmer environment, all at the player's (or server owner's) hands. This could also be reversed back to default settings. This wouldn't effect mob spawning, but could effect plant growth speed and if water should be turned to ice or not. This would possibly be best for creative players (under cheats if a toggle) and experimental players.