Ricky,

The one line system can be used with the normal leash that was supplied with the kite, but I'd hook it to your spreader bar, that way it's out of your way.

Slingshot suggest using the surefire spreader bar, or you can just do a back roll the other way, or unclip after you've done a few rotations in one direction.

I've only just got the bars on our kites rigged up and pulled the trigger a couple of times today to see how it worked, and it looks good. Remember that you really would only be using this say if you got a bridle tangle or something, as the kite as so much depower just letting the bar go, unless you're riding it like a fixed bar, and then you just take the punishment