@ Dan
If agreed
X - Distance ( Radius ) from Galactic Centre - Light Years ( or selectable Units )
Y - Distance from Sol - Plus or Minus - Light Years ( or selectable Units )
Z - Distance from Galactic Mean Ecliptic ( orbit ) - Plus or Minus - Light Years ( or selectable Units )
I prefer to work in Light Years myself, but other may have different preferences.
I would prefer not to have to recalculate - from Kilometres or from Parsecs, this woukd be better as an option.
This would also help in positioning Binary pairs, Triplets, whatever.
One of my Systems has five Stars - would be nice to postion them, then set thme to orbit around their common Barycentre.
For Planets in a Star System ( orbiting around a Star or Star Group ) - AU seems the best Unit
Your existng arrangements for controlling Orbit - variable parameters for the Orbit, including variation of Angle to the common Ecliptic are useful.