But today's development confirms Oracle are serious about implementing the new system ahead of racing beginning proper.
Footage out of Bermuda, captured by local cameraman Jason Smith, showed Oracle positioning a crew member at the back of the boat during certain manoeuvres.
Tactician Tom Slingsby is expected to provide the pedal power, with the other two handle-grinding pedestals remaining in place.
After a perfect start to this block of practice racing on day one, Oracle had a mixed day on the water today. They won their opening two hit-outs against Team France and Team Japan, before being forced to retire from their re-match with Dean Barker's syndicate later in the day with gear damage.
Spithill said the team are still learning a lot about their boat.
"We're learning a lot about different race situations now. All the teams are racing hard and we're trying to learn as much as we can from that. So the past two days have been very valuable, even with limited racing.
"We tried to lock a few design things down for the past couple of days, but we're still heavily into the development curve. There's a lot of stuff we want to do and need to do still. But on the other side, I think as a sailing team we still have a heap to do to sharpen up, so getting these hours in has been very valuable."
If they stay with the pedal-grinding concept, the move is expected to have a few advantages for the team. Not only will it increase the power output used to generate hydraulic fluid pressure - energy which drives many of the control systems on board, it means Slingsby will be in a better position to offer tactical advice to his skipper as he will have his head up and facing forward, while he grinds with his legs.
For more footage from today's practice racing, head to the MyIslandHomeBDA Youtube channel.