rob, get it right, it's a "knee knocker". <img src="http://www.catsailor.com/forums/images/graemlins/grin.gif" alt="" />
I tie a separate line so I don't have to undo a very tight line at the beam (where the traveler line dead-ends). However, recent sailing with David Lennard has shown me a knot that keeps that from happening.
That said, I intend to start running one of the composite braided lines for a mainsheet - and they don't lend themselves to a split tail used on many of the Nacra boat traveler lines....so we'll need to continue running a separate traveler and sheet line.