I feel there should be some way to increase Concentration, as this could actually be very important to casting a spell for a Scholar. When casting a spell, such Concentration can overcome or forgo normal Will and Fortitude checks. It would have a lot to do with the magical nature of the thing. What I mean is, Concentration is a "magical" skill/feat so it does not adhere to normal rules, as it were. Even if the Scholar's Will or Fortitude is low, his Concentration would make up for that lack. Afterall, Scholars are not really known for their incredible physiques.