Ours goes around the sheet, comes through it sideways and continues the loop around the sheet. I then bury a long tail about 3 inches into the dyneema, come out and make a button. The other end of the dyneema tail is spliced into an eye, which goes through the spinnaker, loops back and closes on the button - takes no time to attach the sheet, and is very secure.
The halyard, dousing line and tack line are all attached using soft shackles, so attaching the kite is done without tying any knots.