There is a thread in the News forum, check it out.
As for making building positions relative to the CC, this could be a bit of a pain to deal with. Since there could be more than one CC, where do you go off of?
Perhaps I could design something like a "start position", sort of like what starcraft does, and you can place it on the map as a discrete object. And then all buildings are placed relative to that start position.
I also want to make it easier to setup other sorts of game objects, like rectangles for groups and what not.
Well, perhaps this feature is already implemented in the mapper, but it gives way to a totally different idea. Maybe I should have an auto update feature where it will check for updates, and if any exist, will link you to the download.