Perhaps I am mistaken in my interpretation of some of the location based rules, but from what I understand there is not a section where an admin can add boundaries according to location (coordinate) in 3 Space.
A very welcome addition would be allowing such a condition as a bounding box applied to an area of space depending solely on coordinates.
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In example (and I will be using normal IF-THEN statements here so it isn't confusing):
IF (Player) [x>1000 OR x<-1000 OR z>1000 OR z<-1000 OR y>350 OR y<-350] THEN {KILL} (Player)
This example is a case where a starting galaxy is roughly outlined and bounded as a rectangular prism where players can exist and upon them entering the area not bounded by the prism, namely the coordinate parameters above, they die.
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A system added to the rules such as this would allow for interesting "terrain" features created by admins, as well as allowing said admins to limit player movement so as to make players engage with each other more often as space would be limited.
Again, I might be mistaken and there is a system that allows this that is already implemented, but if there isn't please implement it. This is the number one issue I had as a server admin as people would fly off into the thousands to essentially play single player on a multiplayer server as they were never going to be contacted by anyone. They ended up getting bored because they had no contact, and it made other players bored because they couldn't find anyone.