Ghost indicator in cup
In races where the boats at ghosts have an indicator. Where the other boats are "real" have a reminder announcement with the instructions. I crashed into someone and ruined their race thinking I would pass through.
Wind shifts and gusts would be good.Sailed in a snowstorm once and the pattern of snowflakes across the mainsail was an eye opener
Raise and lower sheets
Be able to raise and lower sheets for when I want to dock or at least not cruise at the shore at 10 knots
Oculus Quest beta: steering
Great application (!) The steering (tiller or wheel) seem to reverse from time to time and be counter-intuitive.