Not sure that would achieve the right result. With a the two line system, trawling the spin isn't an issue. I had a single line on an older boat (not F16) and I don't think a clutch type system to keep tension on would have helped. You just want the sail away as fast as possible. You really want some way of speeding up retrieval rather than introducing more friction. The guys that use single line might have something to say though.