Nothing new about this...the ARP 2600 shipped with several "dummy plugs" back in the day, which were open-circuit 3.5mm plugs without cabling, so that you could use those to completely "break" a prepatched routing, such as the CV sends to the VCOs and VCF. I keep several such 'open' plugs handy for similar uses. Best/easiest way to do these is to just get a few Switchcraft 740s and just use them right out of the bag, without attaching anything to the solder lugs.