It is a question of success and time, as I see it. If you intend to do a fighter sortie you would carry rockets to vultch with. If you intend to hit an object you won't be killing aircraft. If your intentions are borne out in success you should score higher (perks or whatever). Further, I feel that succeeding with an aircraft that does poorly in ground attack, during a ground attack, should then result in more perks. If you spend little time doing 'X' and being successful you get good points here, but why penalize the cautious? If, we are mission oriented, then success is everything and timeliness a non-factor.
Remove time from the equation!

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