PCC or Pursuit Critical Coefficient, is a system that was in Thracia 776 and only Thracia 776.
In laymans terms on a pursuit attack (second attack) or a counter attack, a characters PCC (which was a hidden value and varied on the character), would times their critical rate by that amount, you can have a PCC of 0-5.
Would you like to see it again? Even if it were a FE hack? Not just an official game, which its return is just as likely as the dismount system.