Also need to address the stupid pioneer who got thru and built a crappy little outpost on the edge of your territory. Which usually creates a new border adjacent / overlap yours.
Oh yea, I had carefully positioned an outpost such that once I upgraded it with the +1 zone of control it got several mines at the edge of its range (3 squares). I built the mines.
Then the AI sends a pioneer and builds an outpost such that it is 1 square away from the mine, resulting in the mine being snatched.
Really like both ideas but the 'return home' and 'return to territory' options are very exploitable as free teleports
The current method of insta teleport should be replaced with a move order that cannot be canceled until the unit ends its turn in your own zone of control. Alternatively, make it teleport but with a "delay" of however many turns it would take to walk there.