You can also snake a wire back and forth from one IDC pin to its brother.Crimp all at once, no soldering.
Very nice and clean that one! @larryd you should perhaps even consider posting in some of the other places where people are desperate for those tricks. I have seen several threads where the weirdest and ugliest (solder heavy) solutions are offered. There is even one thread where someone offers to do a kickstarter for a component/shield that splits the ground header.
I am building an interface with about 14 potmeters - so each needs a ground and 5V wire.
I still think the greatest appeal if this thead is wondering what the hell you need 14 potentiometers for and if they really are 5V why you're not using Digital Pots.
It is unusual for an OP to repeatedly omit the reason or motive for a project.