By unclip standing I wasn't implying a track stand. You need to unweight the foot being unclipped (assuming you remove it from the pedal as you unclip), so one foot down with weight on it, one foot up. In essence, unclipping as you get off the seat and prepare to put one foot down. The 28 degree heel-out required by the Speedplay pedals is difficult for me to achieve any other way.