Neither ITCC nor ANSI directly deals with splices or knots. It is in the works however. Lots of debate going on. Each comp has a head judge and techs that will make the final determination as to approval of splices or cordage when there is not a direct ruling from the ITCC or the manufacturer. Best bet, is to splice it as per manufacturer direction, use cordage rated at least 5400lbs (Even some debate there), and use hardware that meets ANSI specs. Bring documentation of the splice cordage and hardware, and be ready to show the techs at gear check exactly how you will be using the gear. And be prepared for someone to disallow it, so bring a backup.