I plan to use the FX freighter that created a colony to pickup 10 PV and shuttle it back to my home system. Once I create some larger freighters, I intend to have them shuttle the PV instead. How do I cancel an existing "Shuttle" action?
Just give the ship new orders to do something else. TO can just send it to a specific destination. If you just want it to stop where it is and twiddle its thumbs, you may use the DETACH order. If you stop it in your home world, the PV will be left on board so give it an extra UNLOAD command to empty it out.