@Justin Kase -- does changing the starmap alter the map in an existing campaign when that campaign is next loaded, or is the map in the campaign pulled from the base file and then stored as part of the save game?
The dashed red line was a bad jump route (over 30LY) - as mentioned, I had to move Tarragona to make it work.
In the SimGameConstants.json line27 is a value for "MaxJumpDistance" set to 30. Have you played around with that one?
As long as there is a valid route to a system (does not have to be shortest!), don't fiddle with "MaxJumpDistance". There are significant lore reasons why it is 30LY.
I don't know that an item can trigger a map change. Right now I have only been able to see storyline / even triggers. I would like to figure out using 'weeks' triggers.