by changing the run configuration for manage.py: run the manage.py file (open it and hit F9), the console will show you a help message. Now go to the menu and find your run configuration for manage.py. Navigate to the arguments tab and just add runserver --noreload. Thats it.
Then you can debug, but your changes aren't picked up unless you restart the server -- which is exactly what dabeeeenster and I are complaining about.