Perhaps I should provide an example of the problem.
Recently I stumbled on one of the problematic paths:
System: Albion
Sector: Ascendancy
Start point: The Third Duke (Zone 8 )
Destination: Shady Vault (Zone 2)
Here the Guidance has you take the longest path, flying through zones 7, 6, 5, 4, 3 and finally 2.
The shortest path would be to take the other highway going through zones 5 and 1, and then tell you to quit as you fly-by Zone 2.
You can still do that, of course, but -if you try- the Guidance then has you quit the highway as you fly-by Zone 5, and then it makes you take the other (longer) highway to fly through zones 4, 3 and finally 2.
Talking
strictly about the Guidance mechanism, looks to me that it's written well. It recognizes where to detour in order to link up with what she *believes* to be the optimal path.
So the problem -I think- is in the very data driving the Guidance.
Taking the shortest path used to be the old behavior. It changed somewhere between versions 3.60 and 4.10
There are more places where I noticed this problem over the years, but they escape me right now.
One of them is in Omycron Lyrae, I'm sure.
Back to the titular question:
How can I mod the GUIDANCE feature?
Or if the Guidance mechanism itself is fine, but the data driving it is not:
where is such data held?
If one of the Egosoft devs could read this and kindly give me a hint, that would be so nice.
Please assist

Kind regards.