I think we do, but it was interesting yesterday. I was on a long, long run across Studland Bay, straight down a very gentle wind (I was doing about 2kts max.) I furled the jib, which annoys me on a run, and goosewinged the mizzen and main. I was very surprised that if I lashed the tiller, she held her course with hardly any input from me. As far as I could see, if she turned towards the main sail side, the main would push her back on course. If she turned towards the mizzen side, it had enough leverage around the centreboard to again push her back on course as well. I don't think it would work in a strong wind, but it was very relaxed in the sunshine on Tuesday. I sat back and admired it and almost ran up the beach.
A question for Bayraiders. Is it easy to goosewing a self tacking jib? I find it near impossible with a conventional jib, without a jib stick to hold it out.