You can clone with
HTTPS or Subversion.
Create setting to customize the execute command for python.
I got caught out by this one, all the tutorials in the MagPi issue 1 are in Python3 and so are several of the Raspberry Pi Python tutorials that I found online. I would argue that Python3 should be the default but definitely need an option in settings either way.
I want to +1 this! It took me a while to notice that the errors I was getting when running my code were due to the version of Python being run. I want to use WebIDE to teach kids how to program using Python. The IDE is great for that, but python 3 offers a much more beginner friendly experience.