As said before, it cannot be implemented into the game sadly, but it's still a fun idea! If it was possible to put into the game, there could be a time bumper for requests that the user can change. You could set a timer in the Options for when players can resubmit a pickup request after you've declined once. "Wait 'x' minutes for Pick Up requests." Or, as Vortex mentioned, having it like a party request.