i dont understand this... maybe im missing something.
typically I leave the sheet in the cam... all the time. it has a stopper knot in the end of it and the sheet is long enough to to allow slack for the other tack....
when i want to use the winch, I wrap it before I load it and then hold tension on the tag end after it runs thru the cam and extreme fairlead, as i crank....
there have been times that i had to luff a bit to get some slack to wrap the winch.
if I want to slack it, I uncleat it and let it out as much as I want, or let it fly after backwinding the jib, if im tacking....
I could understand the need for a free sheet on a racing boat or a boat that had some other purpose for a need for speed, but on our little pleasure craft we dont want to work that fast