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I like this mod. I've seen this done total conversion mods, but not by itself. It's too bad there's not a 3rd area just for level upgrades, but I digress... This is really helpful when you get to the higher levels and need to keep making units and can't spare the time to upgrade your base.
This mod simply moves all the starbase and groundbase upgrades to the upgrades queue, allowing you to build units while you upgrade your bases. It does not make any other changes.