MOTM

Does anyone have any thoughts on using twisted pair cable when there
is no adjacent ground connection on the PCB??  For example, most
third-party PCB's do not have ground connections near the jumper
connections for CV inputs and outputs.  However, they usually have a
method of connecting the shields of all the jacks to ground.  So if
the panel end is tied to ground, is there an advantage in using
twisted pair cable when connecting a CV's to the PCB even when the
ground wire is not connected at the PCB??

Also, as a general rule, should unused high-impedance inputs be
connected to ground using switched jacks??  Some of the MOTM
instructions say to do this, while others don't.