Sure I understand that dual core support is not an easy endevor or as like flipping a switch.
However, there is this little nugget posted: https://forums.sinsofasolarempire.com/301716
And it is indicated by Yarlen that dual core support may appear in a later expansion pack. As I understood it, they're rolling out 3 individual expansions so that users can pick the ones they want and the developers can spend more time polishing each additional faction to be added.
I thought that maybe one or all of these expansions might contain some updated code.
Supreme commander makes quite good use of multiple cores and really RTS games are probably the best suited genre to take advantage of multiple cores.