Are you trying to edit drafted players up to freaks, or trying to bring some of the freaks down?
I personally would randomly select some players in the scout screen to edit (just mark them down, see where they end up, and edit them). I personally would try and keep the overall around the same, so boosting some attributes while down ranking others. If you're gonna push for a Vick type, take an already mobile quarterback, increase his running abilities and throwing power, and maybe drop his awareness and accuracy ratings.