If the crew holds the traveller and jib sheet tight they will be braced from flying either forward or back. Usually while wiring (upwind) the jib should be bar tight anyway. Also if you fly the hull and trapeeze flat from the side beam you'll avoid the majority of the waves.
If you want to race the boat at a high level foot loops on the deck/gunwhale are a no as they drag in water when on the leward side.
Do you mean pieces of rope to put your feet under!?
You could try grabbing the shroud on pitch pole..