Re: Halyards to cockpit?
I single hand our I-28 a lot here on the Maine coast. I added a jib downhaul and have my jib halyard running to the cockpit. I like it for the ease and control of dropping the jib at the end of the day or if I am getting ready to pick up a mooring. The jib is safe on deck with a little tension on one of the sheets and I can quickly secure it with a bungee. Having some netting forward helps. Raising it from its "parking place" is simple, too. My main halyard remains on the mast.
Adding a jamb cleat for the downhaul was all I needed. I have a clutch and a winch set up for the spinnaker already in the cockpit. I used the fairleads for the spinnaker downhaul to run the jib downhaul back.