[sanddrag]

I'm not certain of any of the rules and I don't make any claims on the legality of this but look at it this way, what is a jumper? What is it's purpose? It bridges the gap between two pins. A physical electrical conection. What if instead of that little bar of metal, you had a wire connecting those two pins? What if this wire became an inch long? Then why not a foot long? And what if cut this wire right in the middle and install a switch. Opening and closing this switch would have the same effect as placing and removing the jumper.