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I believe you can agree on anything if both players are willing – but if one party violates the agreement, they have violated rule 6 regarding fair play, and it is perfectly reasonable for the report not to be confirmed after that. Otherwise, it could lead to situations like this: you need to step away for half an hour, you ask your opponent to hold on in the battle, and when you return, your hero is already dead.
Agreements about changing the rules should be made before the game, not during it.