Hi Albatross,
Not perfect for use at sea, but very practical in sheltered waters and for all those ups and downs while getting the rig sorted:
It's easier by far to raise the sail by hauling down on the fall of the halyard at the mast. If there's nobody in the cockpit to tail the line, it's useful to have a cam cleat near the mast that will hold the sail up while you go aft to pull in the halyard that has ended up flaked on deck. If the cleat is located just so, a hard final pull will snap the rope out of the cleat, allowing you to reef and lower from the cockpit. I've used slip-knots, rolling hitches and deck cleats similarly, but requiring more trips forward.
I got some good suggestions from a forum discussion I started here a few months ago - see "Ideal Halyards". We're still without a winch on mehitabel, but we'll experiment this summer and probably bolt something down.
Cheers,
Kurt