Just discovered it
My tiller has a horizontal hole drilled near the end, with a loop of braided shoestring passing through it. Often I have used a bungee of appropriate length, one end hooked in the loop, the other hooked to the traveler track (which is cockpit mounted, just aft of the bridgedeck) to steer the boat while I'm raising sails, relaxing, or going below. A couple of nights ago I was messing around with that set-up and noticed that if I hooked the bungee into the back of the traveler car (Harken windward sheeting), then adjusted the traveler up or down until the boat steered straight, it was a much finer and more sensitive way to balance the boat. In this configuration, pulling the traveler up a little pulls the tiller too, but that is somewhat counteracted by the main's imparting a little more weather helm. The stretch in the bungee allows some 'give' in the system, and I was surprised at how nicely it balanced. Don't know what it would do in heavy wind or on another boat, but it seemed to be a more active system than just lashing the helm.