Rather then this, I'd like to see a "Do Not Enter" marker so that unless you directly right-click that system, your ships will not path to it.
2. Neutered planets would automatically be chosen FIRST for allied pathing, instead of simply choosing the FASTEST path, which may lead your forces through MKIV AI Worlds, Raid Engine zones, or worse.
What does 'first' for pathing mean? Counts as a half a planet? So they'll take a one hop longer path to use a 'Neutered' planet. Two hops longer? Three hops longer?
Much simpler to have a "Do Not Path Here" flag.
Actually, how is pathing done? It does not seem to be random which route is chosen when the number of hops is the same.
To kind of simulate this, you can use shift-click to queue move orders on the galaxy map to control the path your units take.
D.
I believe that your units choose a path based on a value system, it will always choose the most valuable option if possible.
1. Allied planets
2. Neutral planets (destroyed comm station)
3. Fastest route
So if there are no allied planets, they will attempt to steer through neutral planets. If there are no neutral planets, they will just take the fastest route (in physical distance).
So if the fastest route to the destination is through 4 MKIV Planets, and there are no Allied or Neutral planets along the way, that's where your units will go.
The problem with your suggestion, Diazo, is that it still leaves the pathing very ambiguous. Just because you've marked 1 planet as "Do Not Enter", does not mean the second closest path through enemy planets isn't just as bad.
With your method, the player would actually have to do quite a bit of experimenting before finding out which planets they had to mark as "Do Not Enter" finally gave them the path they wanted. Even then, if they were to choose a new destination, they may have to completely redo the "Do Not Enter" route, or significantly change it, to give them the path they want. In the end, you may have to "Do Not Enter" every planet except for a bee-line of planets to your destination, which is a lot more work, and a lot less practical, than just marking the planets you've neutered.