Question Concerning Rear Turn Signals and Brake Lights

I have a question or two for the electrical gurus on the forum - take a look at the turn signal wiring diagram from a Mirada. A friend and I were discussing separating the rear turn signals from the brake circuit so that they would function independently from the brake circuit. So how could this be accomplished based on the wiring diagram, allowing the emergency flasher and turn signal lever to operate only the turn signals and the brake lights functioning only as brake brake lights?