Here is a copy of an e-mail I got with a great idea in it. Thanks Brian for a great idea.
Previous customer here with an idea I came up with for your 1 & 2 point sling.
I'm a fan of this sling for its price, although you just raised it :-( , and versatility. I use it primarily in the 2-point configuration and was trying to come up with a "keeper" for the buckle that isn't used when in this config.
I bought a bicycle inner tube for $4 at Wal-Mart, cut a length of it, and slipped it over the buckle folded over itself. Works great, kind of like a big rubber band. A single tire would produce a few dozen of these "keepers." They also slip very easily over the plastic buckles if someone wanted to lower their sound signature and/or give them a bit more security.
I included a picture of the end result. Anyway, it was a cheap and easy fix for me.