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Yes i would love that since it will reduse lag and i really prefer animated items that will keep moving until you turn the off instead of animated items that move for some seconds.
Animations aren't permitted on here, so that shouldn't be a problem, but if you're talking about ingame (animated wings, cars, etc) then yeah i'm with you.
In a shared MMO based on Flash Player's packeting, it would be impossible to have players in the same room with animations on or off. It is a nice idea, but technically impossible - Just like trading or selling houses.