It would be awesome if u could take out and put in snow, or rain spots, like for example if u wanted more area that snows or doesn't snow or rain. I have build a lot of stuff where i wanted more snow climate spot and spot with less snow spot. To be able to take out sow spots that would rock sometimes snow is annoying and sometimes it's nice. I have made stuff where like a block or two would be in snow area and clearing the snow off all the time sucks, and some times i don't want to put torches or glowstone or something like that down.
Suggestion A Climate Change in creative mode