After a lot of game with all sort of w40K mods I really feel that it is the last thing we are missing.
As i understand and after trying the normal way (a lot) by re generated the map to have Terra in the good place. It is the current solution (And it take a lot of time to generate a 2000 stars map.)

What are you doing to deal with the position problem (like T'Au in Obscurus and Ultramar in Pacificus for exemple) and the non w40K species showing up ?

There is still the possibility to move them to the good position by switching tag, but in a 38 Empire game it s not good and can cause problems. is there a mod for the map ? NOT YET