If I understood it correctly, Spoo asked if he can have all systems 100% turteled except one stripped from all warp points, which would be passable to other players. My opinion is, that it is forbidden. Why?
Because you would have to guess twice where to warp. In my opinion either you leave one system open to warp points (ie. anybody can open warp point into it) or open one warp point from your system to rest of the galaxy (i.e. one point open to some other system, where others can use to access you), so that others can pass into you but they would have to go through a gate you control.
I thought this was discussed way back, but Spoo has a good point. People often find loopholes from rules and exploit them if they are not directly forbidden
Good thing you brought this open, Spoo.
However, If spoo is willing to make a system where others have uncontrolled passage, I am not against it. I might visit it myself