Konata is right, also, in the next build we will get the new powernode system. However i still dont think you will be able to manage this yourself. I believe it works like this last time i read about it.
the start with default lighting with no powernode in the socket, the room is lit as the mapper intended but it doesnt provide power (except marine start). Then the com has to build a powernode on top of the socket, the room will slightly brighten and it will power buildings. After this, aliens can destroy the powernode to get darkness.
So to get back to your question, i think that even next build you wont be able to control that (socket status) and i have no idea how this will effect existing maps (either they change the sockets in the map by replacing the system or the mapper has to change it manually)
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However i still dont think you will be able to manage this yourself.
I believe it works like this last time i read about it.
the start with default lighting with no powernode in the socket, the room is lit as the mapper intended but it doesnt provide power (except marine start).
Then the com has to build a powernode on top of the socket, the room will slightly brighten and it will power buildings.
After this, aliens can destroy the powernode to get darkness.
So to get back to your question, i think that even next build you wont be able to control that (socket status) and i have no idea how this will effect existing maps (either they change the sockets in the map by replacing the system or the mapper has to change it manually)