From the readme:
-There is a new category under command stations and mobile builders: CTRL. In this category, various "control nodes" can be built. These are basically very cheap (1 metal, 1 crystal) control options that are perma-cloaked and which can be built by players in order to change how the current campaign works. In many respects, these are simply like per-player lobby options, except that they can be set at any time during the game's play. These are distinct from the overall settings options in that they are per-player, and a per-campaign. Most settings will continue to be accessed via the lobby or the settings screens, but certain gameplay-centric options that need to be per-player per-campaign will be available via the new CTRL category at the command stations. These options will typically center around ship behavior.
So, basically, it seems like you build it, and get to adjust settings that are normally lobby-only, on the fly. I've yet to DL 2.001ZG as yet, so I've not tested it..