So far I've always unclipped both feet when stopping, then a few seconds before the light turns green I clip back in on the foot that isn't on the pavement.
So you are coasting along with most of your weight on the saddle & both feet unclipped? When your right foot slips off and you get gashed by the chainring or you slide off the front of the saddle and perform a dynamic top tube mount then you might re-think your methodology.