This will reload added objects exactly how they were before, when you quite the game and restart it.
There were a couple of people on the forum asking for something like this, and Shobit even sent me a PM. So I made this simple little example. I hope you enjoy it.
Learning about cPickle and dictionaries with python is recommended.
With a lot more work, this could probably be used for level creation.
-Space adds cubes
-Left click deletes the cubes
-Esc saves the objects position, orientation, and velocities. And they are reloaded when the game starts again.