My experience is that
halyard tension on a
furler is only useful when the sail is fully deployed. At full sail, yes,
halyard tension can be an effective tool for getting the most out of your headsail. However, once I put a wrap around the
furler halyard tension largely becomes moot and has little bearing on sail shape.
I made the switch from
jib halyard to
cockpit some time ago by mounting a clutch/jammer on the
mast (a double actually, one for
jib one for spin) at about 7' above the
deck so I have room to reach up and haul, but can still operate the lever. Once the jib is up on the furler the
clutch holds the tension just fine. The dead end is flaked and finished so that it hangs below the
clutch, easily undone if I need to drop the sail. There is a horn cleat lower down on the mast that I can back up to if I ever find the clutch slipping but so far no need.
I considered mounting a
winch but I am able to get all the tension I need by hand and if I want more I can just
route the line back to a
cabin top winch via a snatch block. When I first made the switch I did this more often when under full sail because I liked playing and tuning... now I am usually happy with leaving it alone unless I am really trying to squeeze the most out of my sail for some reason. It's super quick and easy to re-route back to the
cockpit if I need to.