Yes, close it. Put a system shield generator facility and turtle yourself in for the long hall.
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Creator of the Star Trek Mod - AST Mod - 78 Ship Sets - Conquest Mod - Atrocities Star Wars Mod - Galaxy Reborn Mod - and Subterfuge Mod.
This particular game doesn't allow warpoint manipulation, which I must say adds a new element to gamepley, in that my Empire is vast but the different military districts have to fend for themselves as it takes ages for ship to cross from one side to the other. It also makes warppoint dfence highly important.