As we all know FFT is, much like any single player game, not exactly perfectly balanced. We also know that most FFT fans have played the game a fair number of times.
So the question is, do you ever take it upon yourself to institute a handicap? Are there some skills/classes/characters/items that you always prohibit yourself from using? Have you gradually progressed to a specific set of 'rules' you use? Do you make new ones up for every playthrough?