Sounds like a great idea. Do you mean like on chess cube where you can either accept, regect or negotiate a challenge? negotiate means you automatically decline the challenge, but then challenge the opponent to a different time control.
new idea for chess.com
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i would like to suggest a new thing to chess.com.let say
when i set me seek to 15 min and i want to extent my time 5minutes with both agreed.that would be a great help to do any options to do that?