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Already in the game. Note the button to the right of the title of the decision and just before the question mark. Click that, and it will be not notify you that that one is available. If you disable all of the available ones you don't want, the flag will go away.
I think a small QoL improvement would be to move the off-checked decisions to the bottom of the list so you don't inadvertently press them with input lag in MP or something, but other than that the option to disable them works pretty well already IMO.