You can play any time control as unrated. The feature is already here.
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No clue if this has been brought up in the past or not, but...
Some days I get on to play, and want to just mess around and play some games without worrying if I am going to win or not (like going to a chess club and playing people for fun)... I want to try some new strategies or openings to see how people play against them, or even get some feedback from them. Except, that I don't want it to affect my rating.
Also, there are days where I come on, and don't want to loose a bunch of games because I am rusty. It could be a place to warm up.
I could see it as a new feature for chess.com?
I am curious about what others might think of this idea.