So I'm halfway to my 1st trip to Duna with a single Engineer piloting the craft and I go to add a new maneuver node and I find I'm locked out. After some reading, I did't realize you either needed (a) a real pilot or (b) a communication link back to KSC. I'm well outside of comm link as I don't have any of the really big relay antennas unlocked yet to setup my relay network.
So, how can I get around this for this particular mission? Is there a way to remove this restriction to allow my mission to continue with maneuver nodes?