Interesting discussion.
I have a very weak L knee but it's always the L foot that is forward when coasting in an aero tuck; and it's always the L foot that is down when coasting non-aero including standing.
I always unclip the R foot at stops. The only time I unclip the L foot is when I dismount.
On long descents I will switch to my R foot down/forward to rest the L leg, but it tires easily and feels awkward.
When cornering, Outside Pedal Goes Down. I had an incident of Pedal Strike and an incident of skidding out on a corner. Teachable moments.