PixelFox's post in Is there a way to make a single player game with this engine? was marked as the answer
My advice is don't use a screw driver to hammer a nail.
If you want to make single player games there are better alternatives like RPG maker... Intersect does 2D Online Games Best.
But yes its possible, but it would require re-purposing a whole engine, or running the server Parallel to the client.