I've actually mastered starting from a stop while seated...and my saddle is definitely not low. My right foot is the foot that I always unclip and it touches the ground with my toes. If the stoplight is not unusually long, I'm fine with this method and I can take off with relative ease as long as I remember to gear down into an easier starting gear. If the light is long, then I will often place my entire foot on the ground, which in turn, forces me off the saddle with my left foot still clipped in. Sometimes, if I'm stopped at a light and there is a curb nearby...I will rest my unclipped right foot on the curb and start off from there.