I think that for the new version of minecraft, they should add, as opposed to rain in deserts, sandstorms. As well as small tornadoes that appear sometimes. They can toss the player or destroy trees and move dirt in the terrain mirrors to see creepers sneaking up on you and parachutes.
mirrors would kill the clients rendering speed, on all but the latest graphics cards, possibly them too
tornadoes could be done as an entity,
Parachutes, I like the idea, and could be done by attaching an entity to the player
so i give these sugestions 3 out of 4
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