The problem with just using foot straps...they do little to stop the forward swing and can actually lead to a badly twisted foot. They really just help keep your foot on the hull during wave slaps.

We use a "crew retainer" on the Tornado. The line is anchored at the upper rudder gudgeon and lead forward along the gunwale with a hook attached. A shock cord is also tied to the hook and goes all the way to the shroud chain plate, around a turning block, inboard & under the tramp to the far side...gives lots of stretch. I put black plastic hobie-style trapeze adjuters on the line so that we can easily adjust the length of the line while on the wire. This allows it's use during beam reaching and also downwind, so crew can be forward or aft of the rear beam.

I've tried to make a beam slack sucker but haven't found a reliable way to make a pulley pass through the hole in the end cap.

I highly recommend a setup like this...esp in distance racing in rough water. Our butts have been saved numerous times due soley to the line keeping the weight aft during bow stuffs.